Malicious PDF — malware analysis report

Static analysis result for SHA-256 479231859c4f78fc…

MALICIOUS

PDF

98.5 KB Created: 2021-08-09 14:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e8c1aa66559041b449f7a57f9a04a1e SHA-1: 3a4ecdb6bff9203239b652a71ec0d0e842f2a1ed SHA-256: 479231859c4f78fc2f4aff2e0797aade2fd961958d5cbe1ffb53a11523cd0a6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF's structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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://wastran.ru/uplcv?utm_term=camelbak+hydration+pack+directions PDF link annotation
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161043789dd00c---viwikeza.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/9877951703.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/pumatuwil.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/65d7bfc0b4dede965de512aeee0d4cb9/14168571665.pdfIn PDF document text
    • http://fxmeat.com/upload/file/8102d7d5340ff263250e80ca9aaf2541.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/roxubarizit.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/70635214441.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb53d8b7f5---58276222384.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/13j2ati7053dncd9ggej0jndul/jejim.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/19060327584.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tuxoni.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/21727125631.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160741edf3983a---4621408662.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/22572466504.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16093e70d55e0c---wagepebabaxubuzunabas.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/litifunesiwuxixonew.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/xufifuwuda.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ahul2tb3a6surmt222kij6qdh4/zedowa.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcac5ba95d---470814595.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/44588717542.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e257a97c3---guriwedomabolapubudulik.pdfIn PDF document text
    • https://network-italia.com/file/savopuxosut.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/29716387760.pdfIn PDF document text
    • https://wagaskar.com/media/44980645177.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42730ae58---19060401798.pdfIn PDF document text
    • 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_off0001188e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188E 11156 bytes
SHA-256: 420d51e9f7ade5806a0c639a5e51ecb23bacd6b8309fab67d7de08fe6306433c
font_01_sfnt_off00013233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13233 18296 bytes
SHA-256: 41812a15cf7dc44e55db0b771093e09390ea6e9fc5e15c982f88566f9f1d19d6
font_02_sfnt_off000162db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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