Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cefe6b215e315f…

MALICIOUS

PDF

78.6 KB Created: 2021-10-03 08:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b59c07705cae59a1f1f47a1d433b7f2 SHA-1: 5ec0a0fcb3d0993659c7a6653a4f0b54c8066761 SHA-256: a4cefe6b215e315f34fd273b6eac2e5d6f2c7b296099451c95ead25cb2dc47a8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=griffiths+3rd+edition+solutions
    • http://goldstecq.com/userfiles/file/10343229275.pdf
    • http://bbbo.handyfriendship.com/upload/files/33841863635.pdf
    • http://wu-pao.com/upfiles/editor/files/semisalepudi.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/22205601737.pdf
    • http://tuclubcr.com/campannas/file/dudepawenudizogopo.pdf
    • http://140.121.161.111/ckfinder/userfiles/files/dumibavigunadivuzewotob.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0ef907e7a---boviwukafe.pdf
    • https://vsetinrally.cz/userfiles/file/panavumunu.pdf
    • http://haenuri.net/ckupload/files/zejobobigezuzitafozaxima.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16156df6fd68bf---suvoriji.pdf
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/mozoxaxesazalovivukerimis.pdf
    • http://dui-antidote.com/images/userfiles/file/sumapixaxovidufevajonekup.pdf
    • http://maturitni-ples.eu/UserFiles/File/jebizajoxeni.pdf
    • http://hitecds.com/userfiles/file/xafipopeluxenikusagexa.pdf
    • https://architektor.ru/uploads/file/16382304999.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/a5319312adbf343ef0af7aa885408cc7/43914226072.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/d3d952tqbihq059nmkrd2rhji3/tagumubunevumixiruvupoko.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161562cfcca4f8---20954076270.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/lexeve.pdf
    • http://pxmonastery.org/CKEdit/upload/files/makelajofafagijeve.pdf
    • http://cameradungphat.com/uploads/files/54768880890.pdf
    • https://immobiliareincentro.it/allegati/file/dipowapasufidawefateduz.pdf
    • https://limpiezasinasel.com/userfiles/files/nuvinivopunererixozo.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/21987391609.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/45e4e6ca1f6ea8544ab4403bfe105d59/55675896919.pdf
    • http://gps-tw.com/CKEdit/upload/files/potanabevopufe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c136.bin
5f8c1a5ee8a9cd3a243b17286276bb986306d31e2749be13841c5c88c61c6890
pdf-font-stream PDF embedded font (sfnt) at offset 0xC136 10600 bytes
font_01_sfnt_off0000d96a.bin
69b6544adf677acb0b7fedd5bd7ff49168dd7b764cf49167cbf2ae997167f213
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 22532 bytes
font_02_sfnt_off00011469.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 16792 bytes