Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6cf8ecd5074c38…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 22:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 060979eaf4d1b2b9d190c9c6395977c1 SHA-1: ea4a75e61beacacf0da49f09f272cfe58645ca4a SHA-256: da6cf8ecd5074c3895472fdabee20da642cf05be8afbc3c658630f8b34cc16e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=m2+to+sq+ft PDF link annotation
    • http://mientrungpetrohotel.com/users/files/nixexituxixo.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/c0vq8at6u21006q03gd3egjomb/luwudobereganufeba.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/duwusamadoribi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ede9fcefc6b07d934129eef09e4d7f0b/wajowo.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/1007976c82b276542c9bdc19447fd916/nexokametejajexilirekizaj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089f03c0615a---wirojukuvavarivisimumower.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/jobenatotokabekumig.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b13dfed0---62176797216.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/38c148b99fbb4cbb1c94f5826f1b7dd1/kexajowunegaduna.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef84ee54f---ropidejamub.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/38143412841.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0cb7005f00d3d1ac546201660c2add3c/noxabifunewovimogetida.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/24897070169.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160989f321ccd6---65426974132.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/nivujesepi.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/90336451249.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ce17acf32c30166322393b9f3b286ca2/satoganowasaponodova.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6346c636---gesikemi.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 25868 bytes
SHA-256: 74a36086cdad625d0d0130311eee5e29fc4790979292a38915e39743f9c05132
font_01_sfnt_off0001264f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264F 9828 bytes
SHA-256: 7808ca7ced1e3e53ba692fdc5332eb8b073c8076a9d507f9ef22097c0de5bd7c
font_02_sfnt_off00013c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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