Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79ed8a0835e2c85…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 06:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6c9bf26be8708cbc985b9a1a06738569 SHA-1: c6c1a69b8438eeb79faba432a0783a713ba8c4d9 SHA-256: b79ed8a0835e2c85bd503bee7f97d31b7541f42dc421809636919b1f98b9b53b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, hosting numerous URLs on potentially compromised or disposable domains, likely intended to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive links, aligning with phishing and potentially further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bhk-aindling.com/userfiles/files/98332154870.pdf In PDF document text
    • https://bem-sa.com/img/file/wiseritegadexazibenane.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/s7h9fc7h8flkkhg2ug0ek71o3m/12407324707.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/41d070cac5c9332e9d61af2b57110b3e/jepexujexapemuw.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8c107fe5cce76409aaa9b0000f9eff1b/juxowopisamalanejit.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/lajowelu.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/wizopegobisu.pdfIn PDF document text
    • http://hongdacable.com/d/files/59919038134.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11cb7a7e39---fuliluboli.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/59315927984.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/fexiravunosipibokanu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/64699119273.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ecdd4c4422eecfcbbead0ec8c44f50ac/miduzalexopijer.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2b99a4b01---63230207360.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7205527429---80966089967.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/2168a772b6abe2f05b0995cb7aebce90/rerorazobadomazemusedikak.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/48716110477.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/43671391630.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c353bfb94e0---sepizogebosasi.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/8880548820.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/juxod.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/20831940677.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/92300890688.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22071557324.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/xulaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=connective+tissue+disease+typesPDF link annotation
    • https://medlineplus.gov/connectiveTisissuDisorders.htmlIn 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_off0000b445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB445 15140 bytes
SHA-256: ead9d701e711d06314bb8fa930dd7e9b7468c6cd5e24e3e66d3581267e2d6570
font_01_sfnt_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10672 bytes
SHA-256: 7bcd821ed8cd28a461526d69ed965c2b169b5ca804f431bbfd3b101d9df5f6ab
font_02_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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