Malicious PDF — malware analysis report

Static analysis result for SHA-256 54075b5e9b029a43…

MALICIOUS

PDF

95.3 KB Created: 2021-07-03 10:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6133bc7ad3dd44c6d04efa047f41710c SHA-1: 7fe44eca1b76eb711df29bbcbd899ff129cd9656 SHA-256: 54075b5e9b029a432d124ac847f6a2e93230be2a8187c0570b26aedbc464f8b8
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, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f7015cd63---zararemekozezomirajoniga.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/aa129635de1a4637e3feeebce062e449/7624609396.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80a101379---gidiposip.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14561d7baca070ab58f20a50d2d615ee/jafam.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d0g68gro6ol9oj1e8et685ahl0/84619975824.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160739ef48bef6---wotujemovobapilag.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/pugibamevewirax.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a732f8ed930---nupoj.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38a2840731---dazonosikebasaji.pdf
    • http://hzdsbg.com/uploadfile/1624284695.pdf
    • https://pypconsultores.mx/userfiles/file/redefikimu.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/42b3e0fd234689878828463589ac4454/51726733460.pdf
    • http://www.gonouvellezelande.com/files/pudapafulobevubo.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9301bd63d4---39048705030.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3b09ad97cdbc3943a350b74bc7fbaf6c/zipafulaxoxevuzaj.pdf
    • http://gleneaglehoa.org/images/file/pazuwobuxaxiropibeterawuw.pdf
    • http://qunjl.com/userfiles/files/49456741916.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/83df21070592530cc4966a3a17f5670d/nabidukazagaj.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e64493dab---13705868148.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/539e0d8b17e3766a20afcca924d7fc2e/3765659360.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be45aa52a4a---9217683669.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/60291327909.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee57866c1---femizawemawuma.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wotlk+affliction+warlock+pvp+guide
    • 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_off00010d2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 16792 bytes
font_01_sfnt_off00012541.bin
ce804709f7fc491b93b9190bd677ac102dd476526d71f8ad66f75eae6c3878d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 17900 bytes
font_02_sfnt_off000154b0.bin
89a350de713a283b4a9fa4a83549ceaaf890dd642bb460d929b1f233cb082e12
pdf-font-stream PDF embedded font (sfnt) at offset 0x154B0 10964 bytes