Malicious PDF — malware analysis report

Static analysis result for SHA-256 538b04936f6c9334…

MALICIOUS

PDF

94.1 KB Created: 2021-09-16 08:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6024880882ca7d6739884d24bef244a3 SHA-1: c6fecff4721c7570bf8de71330fb7ce81232d437 SHA-256: 538b04936f6c93346208965cc199661b634e9bb00457aff30fc9efeb996d75f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule indicate a deliberate attempt to distribute links, likely to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://siamsankyo.com/Uploads/file/48655558279.pdf In PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/80253396964.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/wisapagipilapujubizitex.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9c9b304c---kuwazuzikexowurezuze.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/sokenadejifubanujejutonin.pdfIn PDF document text
    • http://sro52.ru/uploads/files/49783959671.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/16487105693.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/kofitovabomu.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/pumexobukomeduteledogun.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76787052099.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/lanusopobiwazalikawaxewan.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vigiledid.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/7364573306.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/85798562522.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/zexerix.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/32621298144.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16140f80b011b2---pelefenijalexozudorifam.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/10304099632.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/netujizexijadusoro.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317eae6d540---dipuzu.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109140509131114.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/xoweralipibizetopokuv.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/90906087719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+android+course+2020PDF 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_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 10712 bytes
SHA-256: 5c7c8f292ee205ea3ceed49cba9fc6cd5ef12ddf3500ae31cfe46629b39b7cec
font_01_sfnt_off000121ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C0 18824 bytes
SHA-256: 4bc7c47cf304b95f42920852d00bee9bd47bfb7d89ee150baf287b3d4385ee91

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