Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3e71b0f71a5fd2…

MALICIOUS

PDF

109.6 KB Created: 2021-08-20 23:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8aee6189b1a6f524683ff005ab981a91 SHA-1: 5165a5e4d5588754b5785816aafca693012a8385 SHA-256: 7a3e71b0f71a5fd27a8bda72253dfaa71283fc90ca102c2947cab5d66764aac6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://btegypt.com/file/67510179385.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4defaa985863cac6b41e43f18993e141/gabisub.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/dfa2fb750b24b7d2e1d44de82a84bca6/gexiwasopowowexoj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a9af69e78---detizupewava.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/edad6da9f00c6c27fb0deb6c8b70b128/27348242260.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/67810997524.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mefav.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dizofumuvipobilim.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/wujojesodujetir.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7325eee4390b36212108ec40454d142d/rilusexusiginelinevuzoti.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/35403604054.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/eqdqmpeisonv6lam9ggf556be8/26472774850.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210812025232.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/nebedipezosejoxizenab.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a437fb6218c---farezotak.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gcmf1gq4ks95l5eptjjminfjf3/61224801953.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/pivipivo.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1bda0f42f9b5ed71db2420c0efa50d72/wefesezafuzogixo.pdfIn PDF document text
    • https://izr.fr/files/26257119095.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/guzijima.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/71457487608.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/49679531898.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/gokidirowabedeguw.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86404709b0---3602111447.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e357fd4ec3---rusojaxufixekesisezazegiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vida+y+muerte+en+la+mara+salvatrucha+chapter+12+summaryPDF 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_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 11080 bytes
SHA-256: e15a7569d5787784ee1a69af6f5138f1deb44ab6f75d88a29d46b2f5ecbbcd1d
font_01_sfnt_off00015b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B01 19588 bytes
SHA-256: b74a1b193a18d2ace5bd2b406cf573244ceeb3d242a13a7ecd22b2cdc15f412f
font_02_sfnt_off00018df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1