Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03f6efaebe036f6…

MALICIOUS

PDF

86.2 KB Created: 2021-07-23 13:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dd2b718605d3e476bf779c3054eab222 SHA-1: d77e1cbc514982ce7f734d66c0fcaf5bcd511ff9 SHA-256: c03f6efaebe036f67e4c77764bdf787ec861ddc9751389f5a2a74f31e587013a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The heuristics reveal the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The embedded URLs are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/2c6fbb6cbe412508e8299f7bb46ccbc6/68846105925.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/09ed07c25740cfc175904bad25998d0d/51172112537.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6a42a2ad---23267535782.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/jalobokafuvofom.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd5091b0b---5323286411.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/mirodanasuliz.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/dodeboj.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/24052369301.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/96715875963.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/46525726932.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e088ef2485b---mederuvopewaza.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8ffec8e21cc3c3c7a519f575aba86c80/mubanitabaduponabe.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/66455287686.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb053b6f9---80854005755.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/0dfec99e7ae4e1c96f199fbe68562680/25557096257.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6df56b8ebab6dd8577cc4751b0e921ab/liritanabitazibopofipez.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/jegowuzunesavosunupomodet.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/roljf2h8ik5pmkdckl24rdtepi/17444458713.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/370670063d4255bcfe9f50b1e2402b30/nosexemilugajepevimanije.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/divugipumefa.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/88893804614.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a625e1ceeb---54830015377.pdfIn PDF document text
    • https://t2sc.me/userfiles/mozetibub.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/91715375952.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d795e4443c---wesulegofitewokokopidol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+approximation+in+a+sentencePDF 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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093B 10596 bytes
SHA-256: 0a786c4a5095abdff7c50e03bcce169a3dbfd40958ba78eb4b6fc978dbb2155e
font_02_sfnt_off00012179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12179 15740 bytes
SHA-256: 026ae5b95ea09ebde98047005d6bfd2fc9f192d4e6439ab76f74c8e149ca3827