Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abb340a00bbc050…

MALICIOUS

PDF

77.0 KB Created: 2021-09-19 19:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94c3573271a6f521ad7f08227b74ce70 SHA-1: 423213476339d63f8a9fdcb0ae9c778fee7caf3a SHA-256: 0abb340a00bbc05038c1b57de7be7a13b64dbfb0e3d985147ab354a255ff082e
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, a common tactic for initial access via spearphishing attachments. No scripts were extracted, but the PDF structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=how+many+androids+are+there+in+dragon+ball+z
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb5c55d1c---mamikab.pdf
    • http://kossuthdigisuli.hu/userfiles/file/surolatapenuvogid.pdf
    • http://sung1.com/upload/files/56699784238.pdf
    • http://nbnjl.com/userfiles/files/kitomalor.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/22135997585.pdf
    • https://bedandbreakfastholten.nl/userfiles/file/nijekedevep.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa41939a4---73821054223.pdf
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/nulusulitovopiv.pdf
    • http://drivescuolaguida.it/userfiles/files/duwofujadamigejumuvole.pdf
    • http://korealabels.com/ckfinder/userfiles/files/tofedawepasejanibokuz.pdf
    • https://thediamangroup.com/_images/files/70528303998.pdf
    • http://tensoinox.com/userfiles/files/7446955363.pdf
    • https://indobaliart.com/sitefiles/file/43660978247.pdf
    • http://schturman.ru/files/files/56308942203.pdf
    • http://dj-maily.com/uploads/pages/files/5024949129.pdf
    • http://zhymwz.com/upfile/file/64328659907.pdf
    • https://lmcmanager.com/ckfinder/userfiles/files/92684007197.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/34779912356.pdf
    • http://teewer.mn/ckfinder/userfiles/files/86214116272.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/zubiberinaboxuf.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b0c9a3d20e6b88d664bc8eca10a3fd0/35524378453.pdf
    • http://amandatravel.com/userfiles/file/mumapubamosabebekase.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/tuteloxetefivesa.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_off0000c134.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC134 16792 bytes
font_01_sfnt_off0000d94b.bin
fac3a756d6847fb5c69cd6e67be54a00ca6e50935b2c6e815698bee3482b2a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD94B 11088 bytes
font_02_sfnt_off0000f2bf.bin
9036d1f10b17476aa4e45989a59415d4ff6ce05978a0997473b7dcfa18c90f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 19776 bytes

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