Malicious PDF — malware analysis report

Static analysis result for SHA-256 6822a3763dbaf51a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 00:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: beb713be07aaec48d154b7c8d9c7ee15 SHA-1: a0489ddde18029c37debf95ef4aeb3b9635944ed SHA-256: 6822a3763dbaf51a4306ddd888ae705ab03ece7cfd549e6e93e48dade652b05e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ofitecnic.es/files.ofitecnic/fck_up/file/wapolebasaxutuze.pdf In PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/68f40c8c376d2d8b49dd4f24acdccfa7/30169271200.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/32370714941.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/pufebepesitovofuro.pdfIn PDF document text
    • http://industrialdevices.in/uploads/junukokibanavotagin.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/69768830042.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dl6qr5i1hbtpvhq601im5cpap3/mopevotexedijif.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lbk2k2p5o5rp8cu3pk965rtdmu/wadiremibafuwusa.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/guxiromonesumoriw.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/tusomeno.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16122bbd521f76---disidakavivogagitosexif.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5a886fc2063ac6cadd32721c3d491ab7/11603469749.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/megaxuwegoluketejobipagu.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/24758617247.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7n8grhi8e86hjup8u5f8gsgmko/67662766881.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/13237574621.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70984a7f44---37656379236.pdfIn PDF document text
    • http://fedoro.ru/upload/file/wofozosi.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/15854159650.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/lisinuwuvikujaj.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/45003363412.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/223794aa5904c485430ac6d60efea7b4/nemavuriw.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16129e09f5abb9---92788798283.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/nedejoravig.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/43033566210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=civil+3d+2016+tutorial+pdfPDF 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_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 10916 bytes
SHA-256: 94f0ccc8435003049d5418f23cbf0ea53eb68b286d2e0ff577412609e1d135f8
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 17164 bytes
SHA-256: d641e764ef7726df414dd3dec23e3af61849f2cef57c5401ff3ecb9cf95b797f
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1