Malicious PDF — malware analysis report

Static analysis result for SHA-256 336e89fea34496bb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 21:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 441893dcf8ab336de6ff3ed3659df7ec SHA-1: 5e935a3f50f502ef40eab1ea3b3a80c5061e2737 SHA-256: 336e89fea34496bb8926ca4447371b52e005efde97f4a0a5565727ef164b9552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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, hosting numerous links on compromised WordPress sites and disposable domains, likely to redirect users to phishing or malware delivery sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users into clicking malicious links, a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=how+to+use+ps4+controller+on+android PDF link annotation
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae89d4ee94---fapurevufosisefurez.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/lanavedifej.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e80e22ef5d---lilujebu.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/begisapigurovalotamubaw.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/63057680400.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79bac94a6---22286660543.pdfIn PDF document text
    • http://all-premium.com/user_file/files/65841376050.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/wevupukeminivozanenasa.pdfIn PDF document text
    • http://pneusmarene.it/images/file/31888535519.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/bt69657itcs2n07mcil4bspn79/lopegopijigelutoge.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/majisexufotub.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/wezudobazerenamum.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95855506909.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/7634205069.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/vumebabab.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7bbdb1016343d4f045a789613865a19f/lajujelopax.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/superinafikuguvedidovim.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/2174513713.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142c60a7066f---28582525598.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/vanotixaxakuzebi.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/60336319755.pdfIn PDF document text
    • http://qdjshg.com/files/file/64280889898.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/xirasazajevugokuz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 10764 bytes
SHA-256: 3eb2b00adc90500ec8f370c74ffecc8519ec5952120dd314dea154000092c154
font_02_sfnt_off0001067e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 17652 bytes
SHA-256: e3919eb42027aba76c550888ce80f13bf8d0ba0be93cd55d81ac61d7fdda8dee

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