Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3f716d53e76039…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 02:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b40648e32da1108fcfff1ae9856030e9 SHA-1: 07a7397b9ac2630e024a7c537cecc925436f0510 SHA-256: 8b3f716d53e76039bf879485fd5e46a142d4b865ad18090c60cdec6f0d46f90c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL findings suggest it's designed to lure users to malicious sites, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/scostmqk9gmpjm9q490sorec5s/wejakumozuwudawugoruwunos.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kfdqdqsl5ottotda7rrvummsh4/diwitina.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7f932c588bfdf39b0089b8ac4a5d1c20/36478206081.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/e62cmrackm064of2mj7urqqddq/17270629272.pdf
    • http://studiomanzetti.it/userfiles/files/9973944968.pdf
    • https://angkoronetour.com/userfiles/file/xokesorarinilemebisozeges.pdf
    • http://metalltechnik-kutschi.at/48094595675.pdf
    • http://lookkorea.net/userfiles/file/sazuwimetu.pdf
    • http://tlw.ro/UserFiles/file/wanavexibobabapal.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/75fa8f61239c8fa23eb1e65ff598025b/28662729940.pdf
    • http://zuestag.ch/userfiles/files/sulanofijidukalalib.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/5786fecbe3ef8d10690e338573e98724/bigenaz.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a463a46d7c2---69547404280.pdf
    • http://alhouti.com/userfiles/file/tozegaxisitafoxasajosi.pdf
    • http://studiomilano.eu/userfiles/files/23193809082.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe7f1d1e6f---gejawedifu.pdf
    • http://stpatricksreunion.com/clients/84553/File/kemot.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b8jerpcuhmp5utq8ehupluho62/9292165128.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d6a8865d---48351134828.pdf
    • https://blokhol.com/upload/files/satupef.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad9ad6653---sijuzeworogaf.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/58877136909.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a45bcb078b76f29e00b1c41fe01547b/52749891215.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=toefl+primary+step+1+book+1+pdf+download
    • 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_off0000dd8a.bin
b17fd61fa79d59471b8f03bb852d09f25bff4ac5e1a447fc88b5d18e3691a9d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 11104 bytes
font_01_sfnt_off0000f756.bin
7f6247bbc1c0fd06aaddc9324c623754f50bdc8609f8b026e68325200b94678d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF756 22488 bytes
font_02_sfnt_off00013296.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 16792 bytes