Malicious PDF — malware analysis report

Static analysis result for SHA-256 d698887f3ca66e0b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf89b7ca48270619f80663566a7552bc SHA-1: 976c4375a42e570a25dc4ae4f7861689fb59e629 SHA-256: d698887f3ca66e0be0b79c3616dfaa41387843863bf02324bb4759a517a7d48e
244 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains multiple links to external PDFs hosted on compromised websites and disposable domains, suggesting a phishing or malware distribution attempt. The presence of a download button lure and password instructions for an archive further supports the malicious intent, likely to trick users into downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 9

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 https://vibanghanoi.com/uploads/files/poxidutadilutaripo.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fa1la5eb7b99kmdf6n2hrlo6h6/76932275530.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/63354784689.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/turusudup.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210903023159_NTY4NTcwNzE2MzE=.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/75351873265.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c3417380a---newol.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/22455222101.pdfIn PDF document text
    • http://konberdbio.com/upload/files/68055715136.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614821d92225c---zizagigenugoferobuje.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/xedabizuluzosuxafavefipo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/ketegonopejofupugukagakux.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/gijujizur.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30732517430.pdfIn PDF document text
    • http://wdnederland.nl/file/68235568819.pdfIn PDF document text
    • https://protum.se/file/31592979061.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/muzijobunudozululezaxapo.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/pululomodaponuwawu.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/wobasuxesutafepofekejojul.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4959d24e3---kelexiniloj.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mivix.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/15953177936.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/62a78afaeaafb8720d3f043dcfd0140c/navetesadi.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/10810878641.pdfIn PDF document text
    • http://infracsap.hu/files/file/54042675487.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/lenovunox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=watch+nenjam+marappathillai+moviePDF 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_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 19064 bytes
SHA-256: 662a6df118485e6886002cf55e9df1be1e08add9c7a488079bb89a8fd4b6e8f9
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 10660 bytes
SHA-256: ef272c392721075b6d1b1d619c55ac47f84128e8b19c856451183a4e2ec22517

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