Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07da0ec482fc3f5…

MALICIOUS

PDF

89.3 KB Created: 2021-07-02 14:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72a89bc8e6397b66bd40d74d203580d4 SHA-1: c55362c517e17879e64aa788207fa5e3aad0bf4c SHA-256: a07da0ec482fc3f5358ae46a8f9f8e64a87a9c28b143eef6758f4edfe710b33c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://synerhu.ru/uplcv?utm_term=instagram+contest+rules+template
    • http://accessiblevehicleservices.com/userfiles/file/63666000499.pdf
    • http://abwvictory.com/uploads/files/94660471181.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/70b7ae96eb4d65e5ce2ec63372de41d9/xixasaz.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609749226dd92---zatogefasofegikijifore.pdf
    • http://djpress.pl/Image/files/77000133183.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/b946d51d9820bc08e570f040f96f547b/75242295970.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/uteu2qne4hikdjkg0minb07vau/58980291130.pdf
    • http://whatdwellswithin.com/file/womizewujisemukimi.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ffac286871c52412322baa45f8cb50ea/jejopusirawutuzuw.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160877f9c0c805---tidujiwitimewomux.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/53515172629.pdf
    • https://opsclown.it/ckfinder/userfiles/files/tagoxiwukitiko.pdf
    • https://ringid.vn/ckfinder/userfiles/files/livamexiwitosokiku.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae04e968f0---vowazemefuwiwod.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f778756eb---rixiradase.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1d7ca9e0a9a9154a3a662da8b63834b8/pegananetomet.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c528849607d---rovejopemuf.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4qtet0qn909evt7fdd2843raqi/rijozofogivawefatixegoda.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59ed5a4a9b---92477860843.pdf
    • https://hasekei.jp/userfiles/file/daguvizawifebu.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/fa8jqs8akmh9acgeqpdolgi0ue/mirosudupaxurifefejule.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ff5ddcb4da659ad1ad7aace1adc440cd/20171342426.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b8707345c7bee8e11ca989f2a68572c/pufabetelozupivonit.pdf
    • https://muguet.fr/sites/default/files/file/91945806278.pdf
    • http://bmsorganica.com/userfiles/file/xilizonekolobagofiruraxil.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_off0000f8da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 16792 bytes
font_01_sfnt_off000110f1.bin
2259563bfd5d600ef900a49d862c86c01aa040e8ec69ae6e13d660cbf152836d
pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 10676 bytes
font_02_sfnt_off00012972.bin
018202a953fccccf836f5453cfbb6efcc01274b4a741f004bd2d0deb411faa86
pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 17604 bytes