Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf24d91ac2128b50…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 00:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a9e247d6e791142872caed41196f055 SHA-1: 922743a4c0c944263c53a43da430bb9d34d04a1b SHA-256: cf24d91ac2128b505febf4e3523e30934a0aea0bc31455976bb80400104709a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS upload storage. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a phishing or scam attempt, likely aiming to trick users into visiting malicious sites or initiating fraudulent transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=bill+newton+hill+climb+racing+2 PDF link annotation
    • https://autoskola-scp.com/files/97855424373.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/betot.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147ac46483dc---7469649650.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210904235855.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/35089901387.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/nulujalifasozew.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/44862711757.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zavisixop.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/kasexebevemizakivel.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/vejidezuzotakeweki.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/rutadiwepagomimegopejifol.pdfIn PDF document text
    • https://agros.net/uploads/file/jinavarepuwebu.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/zozajavosasuresera.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/44777063520.pdfIn PDF document text
    • http://gerocuki.hu/user/file/23506396518.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/bobutot.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/depetiputupan.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/24256822328.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/loboxonufodumasokorit.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417084b7824---29159716907.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/pinajiluxejezup.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/70769648775.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/lisimudipexiladujupanamaz.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/f8fcde53f33aaa9e2a268b750c3abe00/12246202002.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/60423001141.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_off0000bf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF27 15988 bytes
SHA-256: bd3643c6dac68636a15614a7af9cc9a6b0aa15dc12d8770521de84fbb09ace79
font_01_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 10908 bytes
SHA-256: ccff5172fb14553aa45443c3314b5c509539d08dfa96a76bd5d0ecd5cf6b11ea

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