Malicious PDF — malware analysis report

Static analysis result for SHA-256 614bbd6a8be4ab3b…

MALICIOUS

PDF

92.4 KB Created: 2021-06-30 21:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 886a3b6e3d2d536d9bf279ce026a32c7 SHA-1: 923c18b5f1b4512d0acaee8243257cf0a74108e1 SHA-256: 614bbd6a8be4ab3b5409379f7f71ff7b8986a003d1d1f57df5c3a5dfe85a83aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://agroanaliz.by/upload/editor/files/bukifalozavanedos.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e1f0c570---kolujovu.pdf
    • https://xo-sound.ru/userfiles/file/kotutesuraw.pdf
    • https://sieuviet.net/webroot/img/files/xuregiza.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c48caf50---gelolusutixabefof.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377ae938d9---sirogifevineligaruwakupa.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a1ea71a9686ae7d79ff591e2eca084ec/rumobufoverinomovaluxak.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b935fecd---44138119817.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f05597daf08115c1d1d44d7ff7366599/75230886925.pdf
    • https://universitecentrale.net/uploads/FCK_files/file/48576808503.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/soguzonorawukilobixewajaw.pdf
    • https://resulgame.com/calisma2/files/uploads/suvujuzazimugojobe.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/j1i7tumlujf20oo4hm0er7sd4k/velovujiwogitoguvajepila.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609412ec23e0a---nexavipalipubelazusab.pdf
    • https://unitjaya.com/contents//files/nopofirib.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/470374rmlpee2q0rm9uf64kd42/zojilenimobototumunaromo.pdf
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/ludetekofuwotupijug.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/25822d5bba10fb7ede038f9e7bd9d2cb/munapixuviw.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3e7013bc61757a4707a6a46bc387ce94/gimevawezer.pdf
    • http://www.aadhar-interior.com/userfiles/file/67280763689.pdf
    • https://karinbentum.nl/uploads/file/fowezifumuso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=comprehensive+soldier+fitness+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_off0001081d.bin
556c90972e161840ace7e25fd5d3ad8210b0da11fb475503fb8f5d38a6824153
pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16872 bytes
font_01_sfnt_off00013429.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13429 16792 bytes
font_02_sfnt_off00014c40.bin
19755c836ef4e4fdcabd7cf282d22c7861d8e6b8af9fa47a742727fbfd313477
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C40 10696 bytes