Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aea93f04b83dffd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 16:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9383e436fc90bb1e35f4ddbacef645ef SHA-1: b16b0463a01ae5e64b2862f812c2096c42684db6 SHA-256: 6aea93f04b83dffdcefe8ae91030eafad16f30dc10b3bce801eb446522a223c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking. No scripts were extracted, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://chcial.ru/uplcv?utm_term=pdf+deep+learning+ian+goodfellow PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e9cada4ab---17771708678.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/95778326136.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fefufuwofuzozeserojodukiw.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/4650144201.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/44490901235.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa47d844d39---kenusevekufibejosog.pdfIn PDF document text
    • http://guitarenko.fr/img/files/mipapunitegozumuki.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/81791720243.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d2f4015d5e6e00364aca59d7f83beda1/67890740973.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107281548028893.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16076d16763eb4---110804171.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/32455056414.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610663948a2d7---zabave.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/58866125784.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/22510565967.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/zarasexupesiwevup.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/768e6700faaebd06b45b199dd0804500/4899134924.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/k6lil4ano2m5m7q7oa2mhf7ja4/64565498403.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/49274614609.pdfIn PDF document text
    • http://charivne.info/images/file/88513694178.pdfIn PDF document text
    • https://baongochoa.com/upload/file/pajifoxeduwosorixun.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/refapukivisan.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/g6jr7fd1ngcp569h7shdha3eoo/42169095824.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/45557920220.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/jagidedizijexifisogo.pdfIn PDF document text
    • https://tepihtrava.rs//files/51184397475.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000dcd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD3 19484 bytes
SHA-256: bda4fa198f2196f173ca00a5c04f6107bdb17482eac8dc49692f3b28d3b31829
font_02_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12849 10492 bytes
SHA-256: 2eaff0820e10750067aa4b0f0f1805fe5e67e24121e43bc78467de05ac371442

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