Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3744acf0147fec…

MALICIOUS

PDF

67.4 KB Created: 2021-09-26 20:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c6a7f8efe1b76915ca16f848eb1427b SHA-1: 29b73af55eb52f73a92e270f3e72398d3bef1ca5 SHA-256: ca3744acf0147fec5db9c9ad6386cba5f970358f7fdfc90d416afa0acf2f2e5b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.bordadoindustrial.com/ckfinder/userfiles/files/masop.pdf In PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/48917367210.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/22963662201.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/tivamox.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021092001055973499.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/89564486367.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/64948596457.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/67057019350.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/43251830240.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161432a6d2358b---dutapataretuzufejiv.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/60921640014.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161477903ab2fb---75154916653.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210910_B413DBA6E43C2D89.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/34047796521.pdfIn PDF document text
    • https://fptica.ru/images/file/lazobokurulu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/32929512032.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/79370619705.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/visunur.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b4901232d7caad5beb5103b86261c306/9888824203.pdfIn PDF document text
    • http://mlead.net/images/e/file/13934026526.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea2e30ada4---geporefeguwukerupo.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/92614524324.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/sugutejozaziku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=android+roaming+guardPDF 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_off0000ad1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 14528 bytes
SHA-256: 804cdaf83ec79c6679ea566d953ab56476563774609591f7e81bdf315dbfa12d
font_02_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 10228 bytes
SHA-256: 2aa34f5ea3bb371a39081b102a0ed8e711ab42985e3e1982ee5054ef86ea2e30