Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd13cbaca62abe6…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 16:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9b5e0bbf1b236c4003b112d99bba833 SHA-1: 808744f8a9aeb70d85f8f210047ad09fe3f48f19 SHA-256: 7fd13cbaca62abe6e7dd79ffc0a4f7c2bf3c0731c9d544134211e42817083048
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 disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers confirm its malicious nature, flagging it as a phishing trojan. The primary attack pattern involves luring users through a malicious attachment to a site hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hit-air.pro/ckfinder/userfiles/files/lobatadot.pdf In PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090b91cd423a---13702531249.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/winixuzopo.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/93108875282.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/jixojowegipidupo.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dejuludenuritukalexez.pdfIn PDF document text
    • https://attack.lt/images/files/xawoxaduwuvapizidepawuxop.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wenamidenanuwarota.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/40264141431.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4230b764b---birijalinenonegubop.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/72135768315.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5e3e5101b629193e87c4139ac609e4bf/gipakaxadopemosixexupoj.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/31740361974.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/8383061771.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/mupekoputegabilajuko.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aba7da5fff2---pezololowoxad.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608294d860f79---semobategogex.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/34974484993.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609865897b525---60519596515.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/sekuzogekejilijekewog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hooray+for+diffendoofer+day+book+pdfPDF 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_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE84 10516 bytes
SHA-256: 8b796f5ee0009bd67678c8d8246ccf956aa77e491fc9d1e4c8588cecae05a0d8
font_02_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 18032 bytes
SHA-256: e6561ef7b8d548389361e74d5f703ef07ae188576367648b9745386326a9f50f