Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df9d360703dc58e…

MALICIOUS

PDF

93.2 KB Created: 2021-06-28 11:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a0ab1f26e28a2604f251a8fe49cf79a SHA-1: 6eceee930c60b7d506e0ace0d43a6f228a02bac3 SHA-256: 8df9d360703dc58e55fd5bb934d8325da71f7b6bd10779f0284aaf869ea63365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host other malicious PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure as a link farm suggests an attempt to lure users to malicious content, potentially as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9iau6ft0u66knqesols0mjn114/bomuxixub.pdf
    • http://groupkaishan.com/d/files/11205970596.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/c22n0v1m6klg04qhrn3o6vvdhi/46827551651.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2dde6702a04410cd6be0998c365c158c/47858736314.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609070617ee57---99070472805.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b539b00516ea45b6b39c71754ea54579/86941730842.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/kijevuber.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/3c924oulvt49j6loikclllp7pm/nofarixajotekowo.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8ee816e0---75040324121.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79e7b439d---welaxawixupe.pdf
    • http://www.urbanwaterways.info/files/79486467200.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/nbm43d30c01hotabqn57872h8e/35739241578.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k5v17gvhi79a2gq4amcfgigr1i/didaz.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gprqqd3t4egc59k56md7fbcfp1/sexit.pdf
    • http://amirafouad.com/uploaded_files/file/woluporeluxugurawonosuz.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/beturi6rg8urnhuecbrfuiomj5/tafibigakenibotojoxozu.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/qcdtm4o2qdavqtrcbaompmnc1k/1495720657.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b912513f08e---97380405088.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1bdaf9be2b325f4d11643b543966f7f7/fegivex.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1b52b3fe---6545495636.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16089765b08b25---bawun.pdf
    • https://appchecar.com/ckfinder/userfiles/files/bikalapujufupitarijidovev.pdf
    • https://betenagro.com/sites/default/files/file/jokiwatudikasojav.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adf1bd4646---3707082052.pdf
    • http://nage-z.com/ckfinder/userfiles/files/nabivokuvijukaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=not+renewing+lease+letter+to+apartment
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3f1.bin
1f72908177b7e3e08bc49588ad633424c947f889a1c88594a12ae198e99a1a7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17204 bytes
font_01_sfnt_off00012131.bin
c9fa871d706934500ba7362bcc2679cd089fe7f1d29a584b92b55675ed6be739
pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16080 bytes
font_02_sfnt_off00013659.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13659 16792 bytes
font_03_sfnt_off00014e70.bin
88c28061f66e5d05b478f4617b0868837c5260d601ba23bc3a66e89ad9e6ff51
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E70 10660 bytes