Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae73e951bee3207…

MALICIOUS

PDF

90.1 KB Created: 2021-06-30 03:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7225cc8ba8342aac323b8f986710fa7e SHA-1: 497347b7078b983630ec286d1db3cfb246562d76 SHA-256: 6ae73e951bee32078dbd95989c121c5c6162e9d10363cfe18b3cdaf9a92f995e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=monthly+one+liner+current+affairs+pdf+2020
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/694065451b00004756b79bed4964e103/21039213450.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b41560bb---85106039552.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160816afdb095c---kaxubovidikokeko.pdf
    • https://avonsteel.com/UserFiles/file/93141559612.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lrbplmho53q7pq5f7kr8dlellj/rokorejugupatewesuzanak.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6f411e40---29403860625.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0d718039---69087138918.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab102b191c295091ddd13937330373e4/90616826082.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd1c9b36f---kovusetilewavebafimumuk.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b115952e458---13681088439.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0b76d8b0e86e21078bd02f3054e75001/xaseladuta.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/julof.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b289415286b---98780561390.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/amdt0h14qhug0al88a2lh94cm2/82096737202.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1b4ca57c---vosupajakakawukok.pdf
    • http://videofilm-tv.ru/content/File/pokigozil.pdf
    • http://usaoxin.com/userfiles/2021-5/file/nosenefev.pdf
    • https://ebooksweb.net/files/file/39402589376.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69dc412b38---gexifodolev.pdf
    • https://soechi.id/userfiles/file/sufaze.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4c7ee5602062484f5039aa2b5ad29dac/benekipiteko.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4d2cdaf4ee2292e73c5efa8d87c69113/52343941794.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/063540017fe0134c1dc069151cb22e48/255278440.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b94c8459b---maxuwe.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_off0000fc95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 16792 bytes
font_01_sfnt_off000114ac.bin
be168b7fd936b6e4b2f2da418cbb9443681b93ef96ff936c272efe3556908b74
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AC 11164 bytes
font_02_sfnt_off00012ec3.bin
a10684ee78592e89e91b19e6c32b3db2911169586cae362d172fd065c33fbdcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC3 16948 bytes