Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6acc7fa4e1dfc7d…

MALICIOUS

PDF

81.2 KB Created: 2021-06-25 19:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adb65bb1d52fbb453b63a1467b87b549 SHA-1: 08050e212988e0a0fd780616154d898547c1f346 SHA-256: f6acc7fa4e1dfc7dcfa9adcdb5ffcea647e81ddc74368f1640e7b2f7f6cd934d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'link farm' heuristic strongly suggest a social engineering or redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://drafthe.ru/uplcv?utm_term=cast+of+sisters+tv+series
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6090082a---58697642782.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4dd610f620a2fdde357966ec4d1bfec2/74630344438.pdf
    • https://mimpishio1bet.net/contents//files/29351795659.pdf
    • https://mojer.bg/files/devoviromigoneregakanosa.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/82744328268605d8bd2a778091c8e3e9/53231522491.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727ad4a9ae3---wudekuxolazopizuvomu.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086856ab76c6---risekijomewesuzigimapew.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9dd112fb---17135107515.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/1ouecbtav1e0hf3dghmbr5spt7/somugefovuvotuz.pdf
    • https://alshamiltrading.com/alshamilfiles/file/25110759840.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8olurcib7j5mj2q2ctb21a3t30/pevuno.pdf
    • http://taxicityplus.ru/userfiles/file/54794312041.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56372d9a8---88086588954.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1ca2989aa128b6d5ad5cda851fa01299/napufijufiwiwidapa.pdf
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/68663054552.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c873cfb60---delexonemewikafedeguko.pdf
    • http://jedwines.com/cmsCart//upload/file/30094239503.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b868ab52e45---87346688741.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a198b3e02c7---99461616704.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3ff9438d21f08cc8e0bc1dbd717d7b72/topatu.pdf
    • http://rideco.hu/upload/file/60855340590.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12d7f0fafa24e11ffb0a1f839647f545/jetodopeguvubesedez.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53b181b45---wirogotikabifojapoxudokun.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840fd0d5d55---guputebapuza.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_off0000db63.bin
9921264084540f02c53e510b962070d6869a8da8140408ab63f976e13f8af4f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 10156 bytes
font_01_sfnt_off0000f252.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16792 bytes
font_02_sfnt_off00010a64.bin
186431d46d66b08c046838ee9b33847eba49eaa7494fcf285653397712ffd359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A64 16900 bytes

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