Malicious PDF — malware analysis report

Static analysis result for SHA-256 562f784a97bef067…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 02:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4627fc21fac2db78ae22274884b73869 SHA-1: 0d9071d1547f9bbcf37477e889f12ba549de5005 SHA-256: 562f784a97bef067d25415de904eaf89267610efb825063b0d478f0496518f1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further payloads. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ac86rn2n0efpcibqdpjb8qijq6/vudezuroxubot.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6fd676674---puvetorebuvudapi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tgbdv8mq6ha6jtbjp59ruqbf07/loriwugedikuxuxobiwix.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1aca9aab6c8a5f72062bd082d62198d/powobidek.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/6fnmun7ksdqkiq19dmhqvp2p5u/mopixotazesokoxitazefoja.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2f5c68c09263ba88d248e16f39a58138/40789778720.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/bb303fa82a47afc0745399cc0484e002/16890269447.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/35a13fa9d2da7e837735004f1d1fe637/mutuli.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/25736634460.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce60b50321---43131035282.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/gikiwezixaxeguvidabi.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/zesurokonedemizat.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/letiba.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c710f904---4482861777.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/76422470819.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/7704713354.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/binezijudi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/90717599433.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/63774276977.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jojovumafuxekutepivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=converter+de+pdf+para+excel+ocrPDF 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_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 19428 bytes
SHA-256: 3b65f5a2603f5b9266f46da6d72fbf7bda7fdff34804d13ee178449ee566ee2f
font_01_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 10552 bytes
SHA-256: 0383e6b424ecb1bac1c3e7ed6907cb7d120ec4a3680aefa009a7dc8c15d6e5c1
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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