Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a27ab4cbf80efd…

MALICIOUS

PDF

79.0 KB Created: 2021-07-24 09:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: dea4c38523840a8163fd502555cf14cb SHA-1: 330235a5277251977bf16dbda579140dc9c455b6 SHA-256: 71a27ab4cbf80efd65c362e0f5e89e698b4400fdde56759a243e2dbbf9ea9280
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 WordPress sites and other disposable hosting, indicating a link farm designed to manipulate search results or redirect users to malicious content. ClamAV detected this file as a phishing trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external, potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ubranni.com/uploader/files/tikumanusegiruzuludej.pdf In PDF document text
    • http://cokhibaosang.com/media/ftp/file/73755656170.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7756ad963---buwakizi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c8ff5caabb3deb9b1ddc84e39e618381/ninizilukuremarujiromo.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/zogovidetiwed.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/566df017ba3ea8e302136679b78d3280/63409539057.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdd9a9bf5---13611754683.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ibiwudilexiz.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/monudimuxovap.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d6696e6b---vomasukugowofag.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/99538569521.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939ff6b91ec---bofeg.pdfIn PDF document text
    • http://amandamaitland.com/images/file/28935430892.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec05631a9---26435116278.pdfIn PDF document text
    • http://edgecs.net/documents/7144629886.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989aeff2046---32617004837.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1e6a577be330cdabc5d131cccb516894/zuvaj.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/kuxoli.pdfIn PDF document text
    • http://www.kingsmen-cmti.com/upload/files/jixodanalilenuruvaxiso.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pth532a5eeir6691kjfsco7cc3/60695074002.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/61945972397.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc09b05cf61---zezinugazamigazotu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffd7367b5---wufigoj.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072673556ef5---51448443935.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/mekejabutetomon.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/a7mlv4aie5rdcti9pdsvdcorp1/mimabipijagojulasimake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=problemas+resueltos+de+sistemas+abiertos+termodinamicaPDF link annotation
    • 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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 15312 bytes
SHA-256: f7a14d0ce52f889f148b4d695e6389e62e81622830d37edb4fa641518404d218
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 10772 bytes
SHA-256: 9737c470e8a45c1ea46c6d1ce5e56181ab958e72f69c8e7aa2b52b6c0230de2d