Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f9b382d89e1494…

MALICIOUS

PDF

72.8 KB Created: 2021-05-28 04:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a84c089ce9a25a25597e35b24c11394 SHA-1: 9aa53f000dcb037bb2850673262ce90929f413ed SHA-256: 90f9b382d89e1494fa5b31cf15e8c9f821df4539a59b97a18a3dbc83ca2fe107
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to distribute malware or facilitate phishing. The presence of external URIs and a high ML classifier score indicate malicious intent. The document body, though heavily obfuscated, contains references to 'Android test dpc apk mirror 4.0.5', suggesting a lure for users searching for specific software, which is then likely replaced by malicious content via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=android+test+dpc+apk+mirror+4.0.5
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eaf2d542e---gavapujozenaxol.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/fd0a8d8ba1b3cf9a601092dbd6f8fd08/gojix.pdf
    • http://geoplan.su/userfiles/file/pipaxu.pdf
    • https://aydin-elektrik.com/resimler/files/41906951747.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/18hiu4chirvha3cla313daif6b/32617805140.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/l9ek7lbaohkodcsffgmbpvbk05/30733194927.pdf
    • https://cardion.dk/gfx/fckimages/file/jimotomupekerofadu.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/vfugtlnbsa7hej7omog3sgf3u6/zinenimujivixuj.pdf
    • http://casaatlantida.com/userfiles/file/%5C/lisijiwurofas.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084107fe7978---jelapemorodami.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16072807f9e646---82190007338.pdf
    • http://18554080.com/userfiles/file/xavogavobinirepikuzox.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/jmsg3p7o6ri1qmuejos4as6fs1/50076459610.pdf
    • http://monkey-do.net/userfiles/file/laxibixujima.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b6a81d45519826cd94f866160362694e/figitiretararisixugafob.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3c5fc6b15b7529d4953795eef90c1807/bunotovelilop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb1.bin
3dea15f403ed8d324bb3845a7a14cf65ab10ac67b8139747387ff09b0bd7fcd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 5628 bytes
font_01_sfnt_off0000f1db.bin
dff559b53f849ffcdd9f10fa7b6d56a14a161a0acbba67d20bb59108a2133a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DB 10232 bytes

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