Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d99cbc938474256…

MALICIOUS

PDF

100.0 KB Created: 2021-09-07 04:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 113403317bc34d2d20f1a95ce60a090a SHA-1: f7e69f455d7f47efdc50c4c4c53a44872d9a9740 SHA-256: 3d99cbc938474256f690f1fc8b91fe7433e71c45b63ead016e0608ce91731399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing campaigns leveraging link farms. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://queure.ru/uplcv?utm_term=fiscal+policy+zimbabwe+2019+pdf PDF link annotation
    • http://yulintimber.cn/d/files/xanolidu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3fc78ccc---66920120263.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/62884759337.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/84378366832.pdfIn PDF document text
    • http://cissi.it/userfiles/files/sosugarefutuv.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/77471949530.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/xalubenufufumamime.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/muloworidug.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112e1b39fbd3---dalumu.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/59761146276.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/81122718536.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/856775649.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/65216916562.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/8832006702.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/44898142871.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/21729141063.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d2afb641a---34114763841.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wetojovumu.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/17772628805.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/dcfc152a31e6f42011193abce2dfda85/66397212215.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/pa3phs713ghqg9s9u4mim7eib6/49997324399.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/85763492385.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/69918330813.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/sqvdfrn787c96s69j2pnucek3t/88451222479.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7b9b0a9a1126a700709eab382a825bdb/kudisedajalaxevukexilofur.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_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 17940 bytes
SHA-256: 7e220dcbaaa9221986871d534a157398c083aaafe43766b97a2d0a06acb3670e
font_01_sfnt_off00014f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16784 11320 bytes
SHA-256: 65f0779d1d7db66f664b68ea3ed0181e75ff657acf8385fd5a84de72cd607c52

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