Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e43671a1579e805…

MALICIOUS

PDF

83.4 KB Created: 2021-06-27 03:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fcc8e5f5ab8c2ca2680b423f0d62a36f SHA-1: afff0f0cecfc0541d986f26ba2f51d1f5cf35759 SHA-256: 0e43671a1579e805dc3a7807a9cbddc2fee59e23c95dd3e33d9645c1cb5740bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=foods+to+avoid+with+kidney+stones
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074d114077f3---92168578007.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab925014d9f---96302573773.pdf
    • http://babamoleskine.com/files/file/20053379080.pdf
    • http://agcslohian.com/userfiles/file/70376201647.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b35a17e8b---9867913261.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d88c19e34---bonivuzet.pdf
    • http://allamericannursing.com/userfiles/file/kokusupedu.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u6sqe1ur6a5adnt305m0otfmcr/61515325338.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/122d2796c1947de5f47c870ea22a21a9/53492496135.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f1lgoda1vg56vb8gvl5bu9f690/93498618015.pdf
    • http://pphu-joanna.pl/fckpliki/file/19464326172.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077cc284f559---wigomezodifazur.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a3705862030a033d819d0ecf223f7000/76590124904.pdf
    • http://turagent007.ru/userfiles/file/77605988507.pdf
    • http://agataklimowska.pl/userfiles/file/38423618786.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb9fc0edcf---bodenojudejababil.pdf
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/97292296514.pdf
    • http://sgd42.ru/userfiles/file/47167730527.pdf
    • http://edgecs.net/documents/purem.pdf
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/35687493236.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_off0000e537.bin
d01a063b62382d87adc1ce870db7f730529c66d3c9aa0fa4515b47da003e2b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 10536 bytes
font_01_sfnt_off0000fd3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 16792 bytes
font_02_sfnt_off0001154c.bin
09cafc27d77ecd1b356c2549e8eb39908481de5229c4454a6c771d7f81833511
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154C 16632 bytes