Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73bfd05d34793bc…

MALICIOUS

PDF

75.0 KB Created: 2021-06-06 00:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a04aee665d1b2754f8f69debcfb7558d SHA-1: d871e73ac16dfd3afaebc3202ca05e838ad4e5e0 SHA-256: f73bfd05d34793bc261b8b86daae571808ae6f9946a4ba9b64ceaa8fbca9cf49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a lure for invoices or payments, directing users to a variety of external URLs, many of which are hosted on compromised WordPress sites. These URLs likely serve as a distribution point for further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://ketchas.ru/uplcv?utm_term=facebook+lite+apk+download+latest+version+2018
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/av5oeulv1pcqcga5sqq9rq26q9/nuxulusir.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf145c0c1---63903161971.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085800015ff8---20400852425.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/etc0tgfq33fggjfjpkr2tthqna/xonenamopo.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/f7fe23b202a7127d6368d737fcdd07ad/4562061771.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607da9b77edeb---wafafekuvogipusid.pdf
    • http://obasekiestates.com/UserFiles/file/6381667661.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c3af0a38---suverudepidewineninupop.pdf
    • https://mszukam.pl/dat//file/4808225414.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c92299b52---lamefowasudixasafagufifat.pdf
    • http://bomtvplus.com/data/board/file/20210523025838.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/g0kp7u95jcf9vnrej2hlolcd5t/pulolumej.pdf
    • http://amirafouad.com/uploaded_files/file/90133657848.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/96017248868.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/gmrgc01lsq2ll4v5nost4ehdmt/20262139122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5d.bin
be447813faaaefaf100b58f44e2bb30fad6c327559e87953a5c7d7dee795efa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 5896 bytes
font_01_sfnt_off0000ef95.bin
c61ea2a813af3f35aa2b1eafc9a927fd276048e57fe0ddcd32dc7198725d3ccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 19676 bytes

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