Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e73b85bd9c22540…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 05:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4486985719ef08473a0b088d10614ff7 SHA-1: 5d214ca90a6dcb080d2d20571c7a374eaf3ea731 SHA-256: 6e73b85bd9c22540342d4d09f76a202663bcfd3545e8311baa864a3fd7d9383d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and link farm structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://hmconcretemixingplant.ru/d/files/tevarizij.pdf In PDF document text
    • http://studiolorenzino.eu/userfiles/files/52639382591.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf246d629---wuravovuwexuvijevizovef.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9gh46igp1srjn39gscjkl285c7/42981379630.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/podabomapaxa.pdfIn PDF document text
    • http://biomisszio.hu/tmp/50330616200.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f07cf655174---lobuseko.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/pemofumitu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a08e6e493d6---zabesejenip.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/fazekopebedagisigis.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/351tccq2ke9k6qov3hdgncqe42/zunepuk.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc86fa5b29---41694478496.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sajupumojofupogeza.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/2506862915.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/3277e1e6769bf1bbcd0011ef10f58917/vefamo.pdfIn PDF document text
    • http://fitviewer.de/files/file/zevipebaseze.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/bisinovedapa.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0f09c6f9c7976319a74f69252ada65ef/90918992320.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6d1cc4b10fcd4ad82776f2c0d1a41d8d/bobanusotakunukuwitezuba.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772c6549835---xofowukemadub.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/wokenitipexibodoroze.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/88682801304.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/46439928395.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/zedajenig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=guilford+county+tax+websitePDF 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_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 17588 bytes
SHA-256: 59855e63ca60dfc2ab6a9bc1635e93280d265a93f3b35f59fd01f847f6b6da84
font_01_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D8 11052 bytes
SHA-256: b86edc4cee7d4ee6da0bb83ec1d7c2e41310283b949baed3d9e54f56de49e54c

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