Malicious PDF — malware analysis report

Static analysis result for SHA-256 107e992cd3754371…

MALICIOUS

PDF

92.9 KB Created: 2021-07-07 15:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 825331b821c77779e8363e45e60101e8 SHA-1: f48b132896a9ccafee698f28f373b5d98028d146 SHA-256: 107e992cd37543712d7d83af8e7c5340a956879084467e04da5b0382edea0b86
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites hosting other PDF files. This suggests the document is designed as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6b570b7a211ee9e5a74504223fbfd28f/bebolurevijemeduz.pdf In PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/84855387346.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/139145192.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce670106709---lilobiwifulu.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/zebewimamedol.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7f7e3a6f28f014ac3b7220a71afed3ad/polozetudumikelufatubote.pdfIn PDF document text
    • http://poorclarescork.ie/images/57363423013.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/sododapewofesamawuse.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1vepltd9h3u7mtnnc88oe2lca5/2015014641.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/1586354487.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5a5d1e4ac777a71bfd33bf77a6c22d93/belamatalawezoduraxev.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e94b7fcae51ee4acc6fca4b9701cf8e8/89119840088.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/32933500101.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/33179354947.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/bewevugepudemijof.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/13100573511.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7452061131---81508652615.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/1924609467.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f69098fc---febemivorupisuziwubo.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/9c3aebee7ddeeb201785b09138352809/miletuferalabibajarorimak.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab72e1743a0---29216091151.pdfIn PDF document text
    • http://cartopack.com/Images/file/10801888641.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/nobikavawosifuzexawafopom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=as+she+stands+there+singing+for+moneyPDF 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_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 10848 bytes
SHA-256: 5db0059b5d35d09ed58a9b19cacf270f5bb066d7dc596a114e7da2e4bb79d878
font_01_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 17480 bytes
SHA-256: eb5bd3bc580ae5cb40bcefa141e74534a741f977cd586f8faff0ef4319f52c88
font_02_sfnt_off00014e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1