Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e46e88d0c01e31…

MALICIOUS

PDF

95.0 KB Created: 2021-07-23 21:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 231e316706aed36be34c6e835f4ed028 SHA-1: 1d9349f43d7c8b718b487b35aa78187c4acaf7ab SHA-256: 31e46e88d0c01e31b95fa986e7c7a13664e53f93c224411e94c3b8b3632096e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute traffic or potentially host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ff84146cd---niguwo.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abc2e90a1ae---bezun.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/tezifujodagigipono.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/87528230702.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/f5ad6b798e27a10e55cd43cefb0e3b08/rekob.pdf
    • http://kamkmori.cz/ckfinder/userfiles/files/41765867992.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160914aa906179---lajuni.pdf
    • https://aawyx.com/sites/default/imageuser/file/vaderopikel.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacab732624---valurutozibupiw.pdf
    • https://anctools.com/ckfinder/userfiles/files/93438194164.pdf
    • http://stoewebdesign.no/userfiles/file/13489633493.pdf
    • https://resulgame.com/calisma2/files/uploads/18265133915.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c885c46d566---13163741988.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c8df9d74fbb361f07c8574fd4a5c1c97/xusepawanimotamebo.pdf
    • https://prosperitas.be/data/assets/file/21373964906.pdf
    • http://stacjaregeneracja.pl/userfiles/file/zekipuxutifavera.pdf
    • http://files.ibiza-ferien.de/file/17208784448.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16daf4d42a---88525440757.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af576cd54---sosawikugas.pdf
    • http://www.pattyn360.com/upload/forum/files/mifunupub.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/f83a78f0cc968ed1844de360bcdf7cb3/1593090020.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e551d2d3d00---30987979542.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb1b631cf---76288882051.pdf
    • http://liily.jp/upload/file/20210721031454.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=niv+bible+free+download+for+pc+offline
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f93f.bin
eb3231f66fca01d44b0eb1119368d0a0f4fe4e4d6521f94d00d01a0a52886b14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 10616 bytes
font_01_sfnt_off0001116b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 16792 bytes
font_02_sfnt_off0001297c.bin
8bcc070ff20c027f7494cea7f783612adf7e1b6d7f8765a9ac06f5986c6e82d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 16204 bytes
font_03_sfnt_off00013f4b.bin
b1da159770c7e76bafde7071ccac97a6bf45ce976a79edde02ea34848fd59e83
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4B 17704 bytes