Malicious PDF — malware analysis report

Static analysis result for SHA-256 84434f19c1a00419…

MALICIOUS

PDF

92.8 KB Created: 2021-07-09 09:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 79bfa456ba02fa24cefed2012c78f3fe SHA-1: 3c8b7643b5cb07bd6bdb4a8b875e365bc0628f1f SHA-256: 84434f19c1a004195f5d58ace7bf72b2813b649fb949aeb1bc5dfbffce0414fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/r5lnd2ame3jb4mnrmof5bac8v4/66704415720.pdf In PDF document text
    • http://bselink.com/userfiles/file/nemewemekuripapafemajib.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/fusake.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/780490ec3e9c9d29ccfaa83a04e76ddd/26922033885.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/aukdib2m3d5h6999qb3cvhatm0/90293067175.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/48818661902.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/bifigovuz.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a70a4adbee6---zezesitew.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96385995a---bebala.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ck2fb1latjdadmqioe7aeortm0/dusaku.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce53468fbb---85811739523.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/87928868322.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/dolekekawiwukegizasamu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/kesuvuzoxobumosamifot.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zifipadesuzopomena.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wozevuxuweguva.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e141644dea0---44918127806.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/wifijipe.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/da47a27a7e2f0da63e3f22eb2cc1f59b/26796192574.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae71b92d9e5---20014864206.pdfIn PDF document text
    • http://scpt.it/userfiles/files/83933492122.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/adace8827469cb612d98fc7594db2cd6/mikemelatixulurifalixada.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a181642f---balorelejoxerorunan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=please+check+out+our+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_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFB 19556 bytes
SHA-256: d7f5c41d827227ef8b0b0d1756f0f846252de323228a2d8eb2af06b136988f7c
font_02_sfnt_off00014d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D7B 10640 bytes
SHA-256: 96da3414c8fd1608ff7667c4c5e310126dd530b356813760c51095cfaae085e3