Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf512e5cd66c6e1…

MALICIOUS

PDF

84.6 KB Created: 2021-06-30 20:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e376083cc99972d0555856ba2bdc5004 SHA-1: 9fa9badf6ffdeff0f1b050cb2e5f234485ad4d1d SHA-256: 3cf512e5cd66c6e1dc1a7b28c45ba6da521e00c995731b2a7bbbeb6f2a6d3032
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=ap+psychology+research+methods+review PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc59ec5315---fagudabadojapesunivo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/e967321eb5b87206554de564516f561a/35401625564.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/gisasote.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21f9a1f0d---repobilorugix.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/db6c5df262b2bf25decdb57dff6f56c8/40121895930.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ikg1lmburlj0893q9elkinhve4/genafosujigawi.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/bejugusosamuvu.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/tuponusozal.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/4686338622.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/3818992450.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/rpk35450vfe24uv83tjjt40p04/mixuwesuloroniwejupej.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/bosoj.pdfIn PDF document text
    • http://rsst77.ru/upload/files/ziwevirewazuvuvawemanozus.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/c9ad411cc084fa27eb0899cf549e9ebf/93022186337.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097950e2a950---zirozumemotaguwudafodef.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608879cac6eb5---mimitotexebazelikuse.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/70741725750.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fa6c70dba7488da3b8d856ad6d6a2cde/60303295271.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/tefipekuranega.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vidal5qf4kkk63sghkvpi6jeq7/kuzavogofege.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/72mjufc985m1qe8511v744l9nm/wusafekojomuma.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_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 17164 bytes
SHA-256: 47684430db093c1b705d4a3d3d0b3d641a68ed31994625e18975cae4f740d318
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 11104 bytes
SHA-256: 90e8f3bc5dfa615901f98cab07d2bb1abb38ee7077c4977aad3dcb48c27b3e50

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