Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cff21a5c8c150fd…

MALICIOUS

PDF

78.6 KB Created: 2021-06-28 03:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf24e3a39514712393df949f8e5ddc1b SHA-1: bb27c0c2b36dfc28da81acb673d8abb1f390aa70 SHA-256: 0cff21a5c8c150fda99db4dc846b3d07dd4d826b0b09e4808429184c7238e6ad
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=small+signal+equivalent+circuit+of+jfet
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f08a19a57f---64281482201.pdf
    • http://ladyqueen.it/userfiles/files/18609799540.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16077ecdbf3538---rivoroxuwupomezasaki.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9c5jb1f8lbn05fj4nrh5k1v4em/pemep.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608286c0d644a---41774401171.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/cj2so2690acdk12u91t9etua35/94599451564.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a378e6e0814---nipagosuda.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e2d75084b---60063272389.pdf
    • https://argumentua.com/i/file/21465494691.pdf
    • http://cortabellanews.com/userimages/rolagizuwizamakujo.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8a379dcbb---jaletapab.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aedd132fddf---73144283675.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/efn86oarvgc0n3enl6kkotghhn/47203334188.pdf
    • http://shuimotongyuan.com/userfiles/file/nixejujonego.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/unmglvcn0ilnbl3aeiu7e4l903/85564328270.pdf
    • http://indemo.pl/Image/files/52300699385.pdf
    • http://ajtoablakcentrum.com/_user/file/27625723490.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_off0000cc8f.bin
7ef53263a2b769bf7fa474fa41a278793c9ba4cdbccb4964fe1d480d841c563d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8F 17904 bytes
font_01_sfnt_off0000fbb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB8 16792 bytes
font_02_sfnt_off000113cf.bin
1c3c1cad1b78bf867e671a9395086b007883dd2a1ab295d99a5bda53af14f07e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 11196 bytes

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