Malicious PDF — malware analysis report

Static analysis result for SHA-256 a083de5eb028e999…

MALICIOUS

PDF

96.8 KB Created: 2021-08-17 05:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ed33ee7d3373cd88c5d0f7fa332e041 SHA-1: 0e0a39a5d5da620b7f72d000fc60b65828361fb6 SHA-256: a083de5eb028e999dd1b635448ef8f8e5415f73a77a4d9901f1565a3f3d8588c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=clash+of+clans+hack+apk+download+unlimited+everything+th+13 PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/1a9e271c3e0cf807429b1ead8d79fbdf/98235529261.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/vawaravasigonob.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fc4a5c820---86448973967.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942e55b9967---70142783240.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/xizuxubenokizobutulil.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/61751946277.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86ed2a5ed7---66912128942.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210703_DAC37E6F9093034E.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/8963067616.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/64899991884.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xosudasutozo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/2omi8vvpe06a9l94g1g8ns40b7/84820339453.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b271bc0dd4d---36792697516.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/79229568354.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9a03db15b5182b3b3b5bb7f35b30703a/butipadilebonenojufa.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/23135284343.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b0326ef5817b9394f0fcfeae874c3a8b/fanifedojexabo.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/66a6d0ead983ad27bfef535d9992d643/48443987124.pdfIn PDF document text
    • http://arslanemlak.com/E/file/14182342667.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_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 20080 bytes
SHA-256: ae6e3bedcfe8d13e4161066b0d0fe2e7a6113ba3ad230edfb393cd4217489bc2
font_02_sfnt_off000156f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F9 11780 bytes
SHA-256: 52e40a995ff82e52bd093014f90f18da61961ef7752c5b5b2d1d66a2253a8355