Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df75c7464f9a6ed…

MALICIOUS

PDF

78.6 KB Created: 2021-08-27 23:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc6bf4077718beeef9a42c06a195eab8 SHA-1: 4d4d303768efc5af43110aa74ef813d631d2dc0d SHA-256: 6df75c7464f9a6ed3e76ff326f4fb5c2f7fb3e8facd7cbbe4195c17c949452ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://inwebjor.ru/uplcv?utm_term=snprintf+was+not+declared+in+this+scope
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160770dc860384---86773431116.pdf
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/toruvewegutusevugo.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/148bfb1bb89d92de0d53b63315351ff0/60312397745.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d0902fcb9---pujamisuzizugigewiwokumo.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3e9c17c4---jepok.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/81419645286.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/85b18c005838994e23ba33f4f41742fb/13029267521.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84227c0f8---mimidibatajebu.pdf
    • http://thumpamonpally.com/userfiles/file/pesuwejapapoxizunivijiz.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a595790a304c47a635c00d5328351553/fuzederu.pdf
    • http://dhf-china.com/d/files/lewepajibobofoje.pdf
    • http://flightshop.jp/images/blog//file/fadififivike.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ee92556f---77927067933.pdf
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/20028964378.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e601eb993b---torekipubugavikisa.pdf
    • http://retailcop.ca/files/29081848764.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a33645ea695---pediwujuwaziwodax.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mbk0uei7i13nqgu5f6a639kvq5/wogozipopuvujare.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af91734ce---jumunipofezeni.pdf
    • https://fanaf.com/article_ressources/file/wifubulexesewusuxakoruju.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/98e6aae31fa871c5f41c9a3662727dbc/65261795603.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/sowonuloxifepek.pdf
    • http://amctop.com/board_data/editor_img/file/202105250544.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D5 16792 bytes
font_01_sfnt_off0000e0e7.bin
4a37ce7515ba774976af127da77e1f32154bb42d4f2974780f6fc103a142d4f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 18316 bytes
font_02_sfnt_off000110a5.bin
e746087cc97a43a40ad43f932fdaf1db783632dfd279e17f31d06df69b8cdde7
pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 10880 bytes