Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c473f89f298893a…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 13:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 902e89f3516ad56944a511c82cafdaf4 SHA-1: e3fc24f75fd1fdca9a2a696a71c6db97a56311de SHA-256: 3c473f89f298893a0af8127ca2dd089d49c8dc2acd21f29547566d332af3a21f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=i+don%27t+like+mondays+boomtown+rats+piano+sheet+music+pdf PDF link annotation
    • https://vannordenvastgoed.nl/userfiles/file/56370447581.pdfIn PDF document text
    • https://kawanmto.net/contents//files/6875585824.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/68325433716.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/nedajotajala.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95494400e---dubixorafuvuw.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/jubokafexukux.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acebae74dea---xanobeverupunomagirowixeb.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/jugekatefenuvolomodonabo.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/vujuwamazejodizofoz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a6586262f---rofifanuzodirowix.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c27364f12---bukosurelulaparutixo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbef208295---85084048264.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/54799711663.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/11e74eeea2b979ed51991a812cc5584e/lukanazamaluvo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/a7of8n0616ql7hibof9jdb142o/manaxasodemogos.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2b6df5d---bigutoxanopu.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/xagajalezugowaferix.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/donapapuwolaxa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09c184f3a---95211098682.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d789cf3333a---powuzajame.pdfIn PDF document text
    • http://amandamaitland.com/images/file/fisatukojipa.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608081901567f---dumezegadavob.pdfIn PDF document text
    • https://congchung7.com/upload/file/fupanidukebabikipitewilob.pdfIn PDF document text
    • 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_off0000c34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34E 17136 bytes
SHA-256: a544f92d7b408107be7789c878122a51ee4f7cccf43facc7bd6ea5bdf95e75bd
font_01_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 11404 bytes
SHA-256: f1d5cf5053c7bb5ac09c65bc8adefc3f8bc058f48dce8a833ae83d13bd348923
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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