Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbfbb29d296bd9d1…

MALICIOUS

PDF

85.1 KB Created: 2021-07-15 12:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16bceb883144919b4df5762c3675593e SHA-1: e6aaf4073c4c0ced78d6e65034d75d04f473e790 SHA-256: dbfbb29d296bd9d1c0265601b2b102d2fe2029f5d3163410c86117d7a2867a88
196 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms, suggesting an attempt to redirect users to malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates it may be part of a multi-stage attack where the user is prompted for a password to access an archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/0jg3sad9sic3jiijafsk264h5j/wawusuzumunavumiranaka.pdf In PDF document text
    • http://aimic.com/userfiles/file/92878385688.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/2152399151ae61068b9bac9cd90f3c01/kasomisemire.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef2a5ee76---rujixamigezipipoxafukove.pdfIn PDF document text
    • https://efnnma.org/files/file/xikozijemumezodowiweb.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062215533929.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vekararujutiralenof.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608557ef1c0e4---kuxatuvebinodoxafakixoke.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/aaog9oq9q2jm99fbocbft6sk64/67655869032.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6634f189---49381036293.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/67ffb8b0977c80027cadfdbe50a1e267/20629455039.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/bezobamew.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2addae88e---vizero.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/14366173747.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/9458f33269379e0eecc9001945563b60/gojuwawutabawumugufo.pdfIn PDF document text
    • https://puppometalli.eu/file/65388233609.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/630bc669005e9eeb15a77ec47124686a/62130752933.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/31100047806.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/sidujonukedigarolevisofol.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/14915478377.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/62960961080.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d9e0e602---tawilebilunotifete.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/gukonizukivuraxuluwer.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/39b9251ec4c0e811e66a8cf60936753c/wuvaraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pollinating+passion+flowerPDF 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_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 18320 bytes
SHA-256: 72546a2e2c0966db1174c8b0090788a9025cf2086edfa87172e4e6b995310322
font_01_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 10620 bytes
SHA-256: 829d60b24b63eee334ca90fd08354dfe5791de65c6b24cf1ce93bf4c5a348e2c
font_02_sfnt_off00012f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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