Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a238eb6e9492d1…

MALICIOUS

PDF

69.7 KB Created: 2021-09-01 23:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8e4b5251ddcafa2c3e92e23c8e77173b SHA-1: 4f4421c2df788b384f5f32b0b2440a6b12b6c71c SHA-256: f6a238eb6e9492d1e16d12bf8f9c03043ced1da2f5ff55355c6b9ed499ab61ef
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image lure, a common tactic for phishing or malware distribution, as indicated by the PDF_IMAGE_LURE heuristic. Multiple heuristics point to the document being a link farm hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download of a secondary payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://loyallcanada.ca/editor_files/file/jupirene.pdf In PDF document text
    • http://proart.by/media/file/86989940725.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/916d0c5b4ac5d0a9ed17481f22916cb7/5798185096.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac0b9321e---98290942158.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210826_8FB188C548C68BC3.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/74425321516.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2155abe7---lujenibatofitediwujebusal.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/xewesonesanagawudoni.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/pifikinojefuvupawov.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/polerekelesugo.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4047c3b8---bezizopuviwevum.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/654b883a7d2e14e611a141193b70d61c/tadag.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/dipuvotapupinutukoxone.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/35171447957.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fd789d560c326b7515217c24ff697e20/94085525213.pdfIn PDF document text
    • http://allycatering.com/userfiles/wirod.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798349895bc---37230373444.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/1846613278.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e96cfe816229b138f26bb7d5d9279981/5544168619.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/komuveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=drought+during+the+great+depressionPDF 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_off0000b50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 14092 bytes
SHA-256: 7ede85e8523abf46d4029fc81f312b1a2d7c13a86079556126614daba0004ea4
font_02_sfnt_off0000f02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 10728 bytes
SHA-256: 7c417f7a4a15d04f191bbdb02a6ad632331c419ca02a7717a7b5a4902ef32cf4

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