Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0159f1b44ae024…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 01:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3a42e1780492bf27aa0269030e7d978 SHA-1: 6f07e5d960113eea7f2ab06572eaf1d12f13fb82 SHA-256: 8c0159f1b44ae024c766681abc2b8f6db9a8b1e3904002eeacb1dcc976df65b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the link farm heuristic is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://terminsk.by/pics/files/71133829848.pdf In PDF document text
    • https://intrigantka.ru/images/userfiles/file/42523431317.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099148dabf32---43186617569.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/51988217634.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/fozibitimokileres.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1629424777.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/samipigafadetoxomugaxa.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9c1282d8---rakaf.pdfIn PDF document text
    • http://renovator.cz/files/file/vasopiwoni.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/89437137812.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ff978bed2fc33c51862b9a57bdcd1555/10371211291.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/r43tone6qjuge67e7afg1dog33/punokawaruxum.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a74d78b45f5---26495897559.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16128be06c6cc1---bonekolazefome.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/77666068908.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/fetiwuriv.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/lmqpip2qrgv6s96j10u8sqmo1r/12960217386.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/50545256885a65a13d14a9f1593e4283/lexiloxodumitezupuvu.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/roxavitopolamuruwoxavez.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/suvafugoladugos.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/kuwovugamidezinemokod.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/tineruw.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/64668473400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manual+del+propietario+mitsubishi+outlander+2010PDF link annotation
    • 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_off0000d578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 21980 bytes
SHA-256: d652937eb8abecefb11b0b16a7b47de1de47cd68231f43e300ab44419689a8ba
font_02_sfnt_off00012697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12697 11184 bytes
SHA-256: 1e10c4d420ffeea71e1e232b4f9ab6dd4a991c748afd1e4e99c84bbe87806db5

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