Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e95add86be0ca2…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 13:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aed9099434430a4dd8a75f5578a76b82 SHA-1: 53c4f6408b368f79e86718d6939afc6b01890f0c SHA-256: c4e95add86be0ca27ee1dcd3c971b8e3cf22c8db4a7edbe6dd255456ba10e877
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or scam campaign. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further support its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a pattern of redirecting users to potentially malicious content.

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://pixomot.ru/uplcv?utm_term=aws+certified+solutions+architect+guide+pdf PDF link annotation
    • https://kimtuong.vn/isc/public/files/fckupload/file/gazaleralajubozewoxarix.pdfIn PDF document text
    • https://dm288.rs/slicice/file/48046812603.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/8fbad5982af3dae247d2d5f1a82d4ec1/94778694020.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/78034609262.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/44217236099.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210706042904_jj24lr.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/39636849842.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/59794220245.pdfIn PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/soduxopiludogelu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd1e1b1316---93753258620.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/79830858200.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210607074331_6ryjmj.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/mogofubufilizela.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/81184017505.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/7dc236898b6548ffd51a492c1a974ed3/19991768066.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0dbc7beb5061c4f1799da8c8ce91434a/bikorix.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/20991954525.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/sakudiripalutitudaj.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a80351b9---kakijaviluvu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/896335b57c4425484a4b1f11fa19114e/nuretaxevopudunisume.pdfIn PDF document text
    • https://nadamasristorante.it/file/35546934396.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tadolov.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zuguvulawosot.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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 18024 bytes
SHA-256: b4663bb04e045ae9ac88c7d06edbffb23243abc01765ca1a3016b2c1db8ee814
font_01_sfnt_off00010ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 11068 bytes
SHA-256: 360f21f8410917a71ca519a1adcc4fe508a3b71fd2b47abc91b497b9cac0e62b

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