Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1a25c06c6a3e56…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 15:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9706ae5a3b424b6571a9107833464115 SHA-1: 4bdd472c67638fd2ca9e65bd92dbedc10f3d4620 SHA-256: bf1a25c06c6a3e56b75e542b9ddf7e41a9d8c917db4efa8c47eeba46137740df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the true malicious destination. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://dent-pro.cz/pic/file/39229877922.pdf In PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8c4445b8520e7432f9519471d722deec/42044121274.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161258956a8205---rewejugefutudetajemizu.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/suzibewepudubuzan.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/03b6db4aca16e05aa0f6709b7f4fd336/satiwewosatidobiwajo.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/58071625449.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ac4993789---gumafagujaferejerora.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/66733612788.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/25086598260e95c127d1b4.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/70562225599.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/67113440715.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/dowome.pdfIn PDF document text
    • http://armanetti.com/images/nuxiredakunariluxeganafop.pdfIn PDF document text
    • http://placc.info/up_image/62917658146.pdfIn PDF document text
    • http://www.celso.org/download/favorumunelobufitumijuz.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4797ce40b---11593687539.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kixebobejixajujemewemogak.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pemodu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/pivipelurezirojozep.pdfIn PDF document text
    • http://accronline.com/userfiles/file/tobudabiwe.pdfIn PDF document text
    • https://htchninc.com/d/files/sugizevexigud.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5260bb1748fc68de3268821e7d54a3cb/79378349493.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/57888821001.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4893d1196---dunilarosulafexivididu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=curriculum+vitae+modello+europeo+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_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF632 10704 bytes
SHA-256: bf85c9cc63fa2ce62a1a54db3ee3f194c71437b648f31d65a3aea3b6c3fd93bb
font_02_sfnt_off00010ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECC 17420 bytes
SHA-256: 7127679587c6cfe284617dbc7b7c3409710ddf7b710ddd4d30bfbd17b2ba4300

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