Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1d3b2b25a1a4a9…

MALICIOUS

PDF

95.5 KB Created: 2021-07-08 08:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fe9965d768f205c5a00ab25210b21754 SHA-1: b3ea20f64f131950c51a601b258a33f3d606d454 SHA-256: ec1d3b2b25a1a4a9b95340a85cd9f2b665ae3db4985d9b2f4f17d80b489dfa66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f9d65329f---67604874928.pdf In PDF document text
    • https://cakesandcupcakes.net/userfiles/files/79569099149.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/bubexakipujinaf.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/86244015616.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lrohgjcn5g74a4dsbqi0m0racp/3343007605.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/49706918753.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/depezaxabelazobipefidaka.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c2e6aa915a07ac2a199514b5920a1b3c/sitejim.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/76585919185.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/rolalawubamefub.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/kazekazusofegolaf.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h54c558lnt10k82iclq6j4cvda/nesirilixewopiguvidutimo.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/20546789977.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/favogepiwebolaxo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lurodabewobu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ccdddf541---sefonowu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/71acabdff2a0861dfe23ff1e45ece896/42697216085.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/99942336507.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/9l9ru45u731d76cb500nb203nh/79157368539.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b496afb893a55eb6d41002222cc0cbd6/37965316029.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/j78ebnfrvsvhvaq7nv2bf3a99b/xirafemorigotomu.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842797a09a0---moguxaweritodizolufefasos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=marine+electrical+test+questions+and+answersPDF 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_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 10688 bytes
SHA-256: 1d3650d801c576e120e53f8572fbf81b4e61ba5ad2ef290fc09f28bf1856b9c7
font_01_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 17360 bytes
SHA-256: b88aa296ef8539ae7f984d977147c8c031d741553265c90d82b42c112f81b7d9
font_02_sfnt_off0001589d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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