Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3ddfd4082d3a7a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 05:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1175aa2bdb92edd201a3307a6097ff60 SHA-1: cce9182abc8c1431a459cadadd2a673a5deaf6ed SHA-256: 8f3ddfd4082d3a7aa2c6a3ec3ae10e966ffef89e5c4dcfe3ab56f691f4b141d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a ML classifier and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=difference+between+econometrics+and+statistics+pdf PDF link annotation
    • https://topinsolventa.ro/userfiles/file/69550801297.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/bd3c316a367c821518d49932b227025f/xizekafusezasobewiwe.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/rerutepoxa.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a27d5b9e1432a03bb6886b2fe358f6cd/43020435716.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/7330310929.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/81691211648.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210604_D3B0F7F830045312.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb56cce324---22828690659.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/49116473979.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18d80e3b7a85c31b871eebfd5611a63c/rutojusoven.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160983431e372c---28997613799.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/a551c2c964ae5c657b8b0a7ff46472c8/doxifikevazepijopusimipe.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecc6b539fa---98671853263.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/sl3vrvamt0c3rq6d1upoutj7nn/26159935685.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081c1eb1ee21---72731210810.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb843645b7---wixuleponovulefoperu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/42416275646.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/wiwotosumutukobidatiwu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_054856.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/jidov.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/94985049010.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/voxibazuxomalow.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/ooa6ea6o9vkllrcvn68qfs6mu1/1126234051.pdfIn PDF document text
    • http://pvvc.cz/files/dekotowonubajagejaj.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_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA6 17880 bytes
SHA-256: d7f252c3df969417493b2cdbfa576310bb6c5c293d93a9a2950cb30727c62534
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 10964 bytes
SHA-256: 493cc5904f917f6590588dc23c2a47624f93b130f6c575d745d8bf9f81859b86

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