Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f37b60f6624385…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 07:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3b55988de6a44dc0a652138ef2d6cc1c SHA-1: 6c7263509a93890daa364f95597ca373b95b4491 SHA-256: 26f37b60f6624385cc49201a86c10d6574b9f6b9756ec4fdc318d9ee343df3fd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or engage in phishing. The 'SE_CALLBACK_LURE' heuristic further indicates a potential for callback phishing or tech-support scam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/42rq4iu4bp3luegg0vq3994483/vuzikokuwulokive.pdf In PDF document text
    • http://crmloccitanecr.com/campannas/file/16895022232.pdfIn PDF document text
    • http://ktcz.eu/files/files/41863808789.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/selariwedotajusesas.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136370465839---segazusu.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/fububilalus.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/kisufobe.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/55987218867.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/fawibeka.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/jojevugonewiwubix.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e3874a461f85e4ad08e8ff390bff56a2/32402445093.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://afayl.com/userfiles/file/24519008666.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/bafamuzagovalasubapuloxuv.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/fetarajaditirugalasuzuxe.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/65757060684.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c42f3dc8---30902258888.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///4408510689.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/miloxumalimo.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/6761142711.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/40295551580.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210901140620130.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2affceea9---mijozinulorovikotav.pdfIn PDF document text
    • https://mauspro.net/upload/files/goxumufenomogipasali.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/falamomuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=developer+tools+android+browserPDF 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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 17168 bytes
SHA-256: d1daa660f65bda9fc3db42eccb053d3c471109d7e508947d3cc2eb198e752ec4
font_02_sfnt_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 10676 bytes
SHA-256: df2655e39d4b520b8fdd49cc5237cca1d5557c6051ba55171af57452fa4f51ad

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