Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a4e258b485af43…

MALICIOUS

PDF

79.7 KB Created: 2021-07-22 10:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ab003cae960368c2f46fd1e6ef0b5f8 SHA-1: 300dcd0d31941c7dfcbf8c8c021b9e154b426696 SHA-256: 12a4e258b485af433da2b98084b4e67da50efff8b630382d23a3c264ddef2c63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pescepiana.eu/userfiles/files/mibir.pdf
    • http://paroissedementon.fr/upload/files/dimasufadapo.pdf
    • http://slpclassof67.com/clients/45391/File/zabuvapupam.pdf
    • http://galluccifaibano.com/userfiles/file/313561668.pdf
    • https://menlopark.com/wysiwygfiles/file/figevorudiruje.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f94dc73cc2840d5d44135fbef9d66bac/47000434748.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/54918187440.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a459ab2c2---sewenakudeluguvozakaxov.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f41fb692d---sutawediwomesiwuwaful.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090333080eb9---tagokigogakuja.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/divimesidifevovibeni.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/70437245860.pdf
    • https://addsfly.com/userfiles/file/deweb.pdf
    • http://aimic.com/userfiles/file/10927837586.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a47411704a5---kepegeromawefidojad.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a457df8c97f---24327782430.pdf
    • https://rowadalbyt.com/userfiles/files/79726642603.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb0de2ce08---bakonoxaseniviroworo.pdf
    • http://cp-1.ru/userfiles/files/zudusizomake.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/54bad71030d5f98fcb9057db620c716c/wimikefojelurudufejov.pdf
    • http://minipit.com/data/files/1739156584.pdf
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/57028368369.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f0fd0e05316---72501946954.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=honesty+is+the+best+policy+full+story
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5d2.bin
840c25e408da85ad5ef648d45dd04db9ed0ab0fc3bd7c6a646a43a20ce311021
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 10760 bytes
font_01_sfnt_off0000ee45.bin
436bc052bbaed51db7983a08f7e801223549d053605613f99c63c40f95bbc107
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 16464 bytes
font_02_sfnt_off00011887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16792 bytes