Malicious PDF — malware analysis report

Static analysis result for SHA-256 425feb05bdd34f8d…

MALICIOUS

PDF

90.5 KB Created: 2021-08-09 07:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 741fd073ab7529928b6d3479a3d55e15 SHA-1: 82042c3657d6694aa9ceeab769ff2add958392fa SHA-256: 425feb05bdd34f8d05b60990b4fbe02c58826d6e4bf241e84b4199b8a6419e73
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The file's structure and numerous links align with the T1204.002 (Malicious Link) technique, and its likely delivery via email makes T1566.001 (Spearphishing Attachment) relevant.

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 https://drafthe.ru/uplcv?utm_term=how+to+properly+serve+divorce+papers PDF link annotation
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/favusixujebekefaxus.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/55609207666.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/10609101076.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097d3d3e8f6e---33907970186.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/79365516961.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/wuliniputazopav.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2ed81418f49516eec38769ef086d7311/48623977676.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f2785d08a---somud.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab07556ef---komep.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a0067a4b---24827080585.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/1436324072.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff63d26ce2---govinukiro.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/vogenodujodidud.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b7e86d6e---ketatasawodala.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/21084813311.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/92828373913.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c85708cc8---zizoxu.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/75332136366.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/fovozifalenu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d8fc0eda35af5f0cca2c495fe4938d64/6712199727.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g4dgvis6c6sko6lld0lf4o5h4o/dutesexawa.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/43663788195.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16093bab401020---nopigomumarejuzozumonu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 10660 bytes
SHA-256: b914d5ff87f657b7064886ee1bbe6e31cb115e993d9da6d71006d795268efc77
font_01_sfnt_off0001193f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193F 16476 bytes
SHA-256: 1fe625e7e4c3e9e522afcd3179f89127723a975e5a22eae2bdb1e25fa656fd8e
font_02_sfnt_off000143d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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