Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e276db7d3f90d0…

MALICIOUS

PDF

103.1 KB Created: 2021-06-26 22:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 29f746d7d7d9501ebe6907408b6500f7 SHA-1: 0646f2ec5d0721ecf602ada0cb0cf0932ff432eb SHA-256: 98e276db7d3f90d047f2894f8cc8eebc2c837a88abacd810080a33aa66280c99
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, identified by heuristics as a 'link farm on disposable hosting'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as a phishing trojan. The primary attack pattern involves directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788bb77a9ba---lenudobupojopifunemut.pdf In PDF document text
    • http://tcsm62.org/uploads/news/file/17734411795.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j5im5gh0aan12irnfvncpmp4ds/bezodugisupuw.pdfIn PDF document text
    • http://cpils.com/userfiles/file/puzuvajixefaki.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/fawes.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nkl59eok1hee93k5jiteiibgqc/85158370154.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/4744112598.pdfIn PDF document text
    • http://isgsrl.it/images/file/zeveponuvewejizexejelowos.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/72554905986.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4da82b35338c6769b47e4b43d22512ce/52704286667.pdfIn PDF document text
    • http://iccarrentals.com/files/file/sutikusaposexo.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/fuzeb.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/p9se1cq3jt3g73shqg30lpql2u/93688298005.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0295a48fe---15631237824.pdfIn PDF document text
    • http://centronegozi.com/public/54406961082.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fazonuxulalijusi.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/14344627246.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6b47ad71919a6a310ded85b9b3f2f203/30287794752.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160868beb935d2---mojedusomenowedemamif.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d844c8083---90305976666.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088772688025---wokov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=concise+meaning+in+englishPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69ba5b1ffb---venewevufaratal.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000107e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x107E4 20080 bytes
SHA-256: 3918f1524826f5aa878295154e028a80649e2e60ee9d213afa1fbdca84fdb22e
font_00_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10512 bytes
SHA-256: ee928e29f9e463acaedaf1dbee7aef60255c23b12604d38ef781a4d8ee6becc5
font_02_sfnt_off0001296e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296E 3380 bytes
SHA-256: 6d9bd9b811f8f3b48d5e54308237fa9388722fbb3e981f9bfa31cd600fe18edd
font_03_sfnt_off000136cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CF 25768 bytes
SHA-256: ae05fcb57d235f50face49dcd2e8055c1b8ffc5b126ba7b437c5359db3c0843a
font_04_sfnt_off000174a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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