Malicious PDF — malware analysis report

Static analysis result for SHA-256 299320a7df97e7cf…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 14:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f7775f0bace7b24e655f1844a5499657 SHA-1: 400d7321b7bfe34891ed4b5438381e3f4a28d14a SHA-256: 299320a7df97e7cf286e9cbd63d316d8222bd07a6b69d507e51d6f7242a98eb2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and link farming. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a lure for users to click and potentially download further malware or engage in phishing. The heuristic 'SE_CALLBACK_LURE' suggests a pretext for social engineering, such as a fake billing or security alert.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=macbook+air+loading+bar+stuck PDF link annotation
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614070b8e3594---napiwusuxefogolalawudef.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://iglozawiercie.pl/zdjecia/file/folaxotefigegagefurojixiw.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/38670976854.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f4e206124affffb9c1170df83bc7980c/gapimur.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/50209920424.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/foterowi.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/99364049132.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140102b95425---powetukaparive.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/wejetowepakarapu.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/nakujopedunidepuwizugar.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210912031727.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/puzalij.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134edde21e86---kabaluzulenesu.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/masamepepokonasonuju.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/jezenefos.pdfIn PDF document text
    • http://kodemari.info/data/files/34630451578.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/jixapu.pdfIn PDF document text
    • http://hongdacable.com/d/files/jujijulufatigarajilumud.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/19535330076.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/88148859444.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef57980ea3---bijabamojatupobogif.pdfIn 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_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 17864 bytes
SHA-256: 2b38311a8dea2e1ffb165f4f5f1ed34ba8a96667e2988de256117d0d5ffe8693
font_01_sfnt_off0001063a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 10736 bytes
SHA-256: 219679dee958a6211881beb0e11ec0af8a58f67f9dae1a543e07712667623aca

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