Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d4cdef8f9f51d6…

MALICIOUS

PDF

88.7 KB Created: 2021-07-22 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6c6496e7b79a7319262ca158d5eaa75 SHA-1: cca5a5262ea86928f0bef6efaf2564fc2b7e55b7 SHA-256: 99d4cdef8f9f51d66a596432521050f410f575e4852147b1d8d9f19dc69c7bbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b411295031d---ziwopivedokaleja.pdf In PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6349135986a3566b0c15f09bc537bf89/nupirovatarisemekaz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1119d0185---68466086857.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27dd9f649---95216683259.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/86947791467.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/banagudij.pdfIn PDF document text
    • https://wittnebel.dk/file/98547611606.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9f8045b8db76f4bf2621b4a9ad46cbfe/wobav.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/kopuge.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740e28b1f37---24245697474.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36b7e08bb---keteluzabapemisiganegeg.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/zetivakefatovojoxo.pdfIn PDF document text
    • http://sbkf.org/files/files/93384592741.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/61663503164.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/varotekamezodemo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/95bcf15d6588a4b3a648822223f7e86f/xoxivofopikaro.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/rotetamam.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/o24u27tmpt58n7ef1cak0cn5lk/lebimakitojetapizatej.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/21882027066.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/1bslqcs348dso57395m0ep509p/61841958311.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add915dd17c---74534924139.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c38983acaad---wosikutavolemes.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2d935d968---visowomoxubedovukor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=list+of+playmates+of+the+monthPDF 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_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 16440 bytes
SHA-256: 956080cd7e083f678132d982b2f4fa1cc2fb8e61ffdd0d69f0a5668bae019cff
font_01_sfnt_off0001226c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226C 10596 bytes
SHA-256: 28d7aa203aa7a58465dfae7f380117dc846db82a9d4da6333125ee180fd22a5c
font_02_sfnt_off00013a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1