Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7bb4b7c67913a9…

MALICIOUS

PDF

85.3 KB Created: 2021-08-26 11:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 624879c12862d6db3918e07d167c6f3a SHA-1: c89c4342efb6d002727eef627b83a38052ceb40c SHA-256: 2c7bb4b7c67913a984a4841164bad5580f58642c714c8de5e85db564b509f51b
154 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered, disposable domains for hosting these links, a common tactic for evading detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9270

Heuristics 5

  • 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
  • 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://emmaushuis.org/pages/mudulowagivek.pdf In PDF document text
    • https://queensflower.nl/clientfiles/xetosukamalipuroduguji.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb3fc89e1---noxorawalafobatasot.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/xaxawarewamuxuf.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b7dd2cfb4---27187310533.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2e2c6f3139caa85cc52b5e5fd5c7a04b/nibodonerevejofafafadipa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ed5335441cb3ed8aa4654e1b1d19cfc2/fuvibito.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/31981ef28021a46892a64b7ef07d29a8/vanijolasu.pdfIn PDF document text
    • http://elskenecologie.nl/files/71375504722.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/53878300837.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455b7b0808---16118989124.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/napubirogapafuloxu.pdfIn PDF document text
    • http://redactron.com/userfiles/file/topetinefasumezu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/52881450184.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b67667e33---35001145869.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b7c8ca5c9---zanadatinadimewupuragi.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/vonepepoleravefagorivelix.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/piraliseja.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609191f531a2f---29911688686.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/34185697507.pdfIn PDF document text
    • http://flirdining.com/uploads/files/58457453094.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=tell+me+your+weaknessPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 17576 bytes
SHA-256: fc1f1ff451877f59adcfea57d674ff7c76a89db44230ce6a8f8d09daef69723f
font_01_sfnt_off0001360c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360C 10432 bytes
SHA-256: 1921135bf7ad1d8d810920345cec9dc574453a956731c2d60495bc15c41826ca

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