Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc19ec6c3d02ca3…

MALICIOUS

PDF

117.0 KB Created: 2021-07-13 17:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 656a79b6141a141a24ebf010d675a8fa SHA-1: 828ceac51bc6789eba7cbfc79f136013cde0465c SHA-256: 2bc19ec6c3d02ca3ae2692264af1fb42fd6ce667c595abde9faff9c3590bda83
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://efnnma.org/files/file/diwadepodifimiwup.pdf In PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/naxoluzirulokuposomeba.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d7f0f809---tasidivogixapepi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16091fa704b143---80009837346.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/58317693411.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/fidipetewotunukunujof.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/83180019420.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/efcc2677e57aadf766ccf4fad78ff888/titemu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/vebelowuxejibuzibonewirud.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7405b0123c---3043338768.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d2bf620c2671e6398c264f0aaa9f4060/wotudol.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/43138225972.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3860ad6d---38272681602.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/97525876949.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87be8c1d5---kemafaropimilukamiketuf.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/vebivifisabej.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d2682a468248f775a0448f3883968a6/59986041437.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4b2eb29f0f497e01ef15c9086dd1d509/pukamosadisemi.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zujovikijenawodetumoro.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/048f46e8833d28cea1af430db13c6c23/42772643164.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffffd0b023---fimugolidagimafa.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/13396543763.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/36517700766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=should+i+go+to+college+in+state+or+out+of+statePDF 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_off0001661e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1661E 17840 bytes
SHA-256: 0a3dff70d74ed50b4b2d1d383bb4f55d2b7cba6b19818738d119dddb08e16368
font_01_sfnt_off000194ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ace5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE5 10932 bytes
SHA-256: 1a1cee11eecd006e84d7467f5d24ab17a1842b7d9d2cf728a374908f7123dd0e

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