Malicious PDF — malware analysis report

Static analysis result for SHA-256 4859d645dc3c3fa8…

MALICIOUS

PDF

96.0 KB Created: 2021-09-01 16:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94f8b2daf826667c4e8b310e9a245ba2 SHA-1: 55ca7ec3709f012254cf1d12f0c2db9db1cb6f80 SHA-256: 4859d645dc3c3fa83424bd8791cf90b32b2eae704d3333e119779a6a7cd4cc0b
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it is a lure for payment scams and redirects users to external links hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/sodoloravotu.pdf In PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e8a39f098---25933415890.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4bceab8aa9609fc4eda82da76c1ab360/xugujitekib.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b07671dbdba---1379315859.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210705181039.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/49258625885.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/kobupi.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/xetux.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e022489b---pavabowojemejetize.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/30950130557.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/bidob.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/4548434232.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/52967328967.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/85843fda607fc4c35a47201a711a4ecf/62134640775.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942b88996f8---65786878915.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/1nivebtfglcopprra2kam1c4l7/sisomaxarafozagixenodovid.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a0f3eb2fa---bezolevarufonabi.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/64107697082.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93fb1967a7ef91b511cb2b06d9d23ad3/29984834281.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/8hlk3chgk3dl6ia0qcke1np8tb/1843484875.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/71934317769.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/siviwibini.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/18391216355.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9ae72da1---mexowuwixuvinud.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cenc6j5bod59r8tdgnifq0ef82/64896772115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sale+invoice+format+in+excel+gstPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 18376 bytes
SHA-256: 99390e779fedf98a6276ba624910e642962c8bacc5b4d1b40feebed675665a09
font_01_sfnt_off00014061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14061 10924 bytes
SHA-256: 8bd25a82408862e0e38ccc2f47602b5b58a5a94cd3b48ce2566e961566fc3bb1
font_02_sfnt_off000159b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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