Malicious PDF — malware analysis report

Static analysis result for SHA-256 7407e1fa63179f8c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 17:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01802bdd5ae163356c37257dc77e40ec SHA-1: e1eb6191227ae3e6a6320d9af397c9e60a437094 SHA-256: 7407e1fa63179f8c6aa7f82e78659c4faa9c88a1a6355f589aadeb8f44918089
164 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics suggests an attempt to obscure the true destination or to leverage SEO poisoning for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gregor-biffiger.ch/userfiles/file/33709055197.pdf In PDF document text
    • http://closehorses.com/userfiles/file/8818641309.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/wiraniduwe.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jgrpvfe41v422r38radio09fbg/tulunoxakipibojij.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/79033168464.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763ac1c9847---vigonerix.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/596ad6a327a99afa5e6d6364d6df8076/35298833004.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/18095724320.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf1553c14---megurudexetanegojivi.pdfIn PDF document text
    • http://webursitet.org/Files/file/23806957269.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca2d16f261---30973108672.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/65582444524.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6766787d---wojugipi.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/gasovopazoko.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/25710388446.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/61833712223.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091abc594ea4---45660566914.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/4569185811.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/vugefonolipi.pdfIn PDF document text
    • https://arerp.kr/data/file///wetukapogoruko.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/fazewejademadetajawodim.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729e7b49e8---51562982551.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210825052133.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/87688406217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mutants+and+masterminds+basic+hero%27s+handbook+pdfPDF 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_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 18788 bytes
SHA-256: b7301cf6068f084d4e08bd062528f22f09a0082a2d5ff193efd598d7960c709e
font_01_sfnt_off0000fb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB25 11196 bytes
SHA-256: 2124e92fbc95352676e091d5b5f5bca6f3a4641ea37b2e6bead80c47badbe658
font_02_sfnt_off000114f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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