Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d99e038fd29509a…

MALICIOUS

PDF

98.8 KB Created: 2021-08-09 09:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0d4d3880dab872d3edda9ed8527db1c SHA-1: e5be653bedd40910f59167aa55154ca337f8647d SHA-256: 5d99e038fd29509a3a8f272c2cc17e914ae1143adbd18364e2173084394c924e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The primary attack pattern involves luring users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://arablift.net/userfiles/file/somanivajubinagugovuvezuf.pdf In PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef4bc45c1---29831853206.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca0f3ae19d---76661064383.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/nixiratilip.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/tinidimebevul.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/vesigamivipuwi.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88198579446.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/20226463048.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/773ca55e0f6514782b042e19b8bf05c3/ranaribenigikakiji.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///62154552227.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/batuxopif.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/jurisul.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce11b5f28---71856041149.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e7128cf4---95351660471.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/24793048225.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbe1025b87---69745995565.pdfIn PDF document text
    • http://falerisztika.hu/tmp/jifonufazetawuf.pdfIn PDF document text
    • http://w-mill.jp/images/file/9667571956.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/35984487104.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/65308033082.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/4fdf9925a575b6c9d1b64ec638eb239c/jugoxoxarilig.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/86237659738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=layne+norton+phat+excel+spreadsheetPDF 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_off00011cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 18544 bytes
SHA-256: f5307d03d7313354e1f60e75138a78ad4e6271b3f3bf397aedb278234678f28a
font_01_sfnt_off00014bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16411 10692 bytes
SHA-256: 8e96b7448cde933afd35c91758b25522174d741a6fbb8026c3a942018ba81e49

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