Malicious PDF — malware analysis report

Static analysis result for SHA-256 d958241c4c7e2e16…

MALICIOUS

PDF

101.7 KB Created: 2021-09-04 23:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b5713485605dc3c2af07346de4a7d597 SHA-1: aeed319ea1acd370b71f54deda05c9e26bee3708 SHA-256: d958241c4c7e2e16b4ca07b899a478ab6f16d1f209a7f403a1d6d352d7fc649d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely aiming to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://cakenflowersonline.com/userfiles/file/fasanopulabodozekiwe.pdf In PDF document text
    • https://dalton-english.com/userfiles/file/jezupekikij.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/radisusise.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/48983508675.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a24ac2c8b---pubonatawukanoxufadofopej.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/93713678599.pdfIn PDF document text
    • http://kasargod.net/uploads/file/9575792487.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/suluvuwewemivovevexo.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/duxovirevawafiwoj.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074134352329---xusurekigimekulotopudez.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/18541963236.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gsfismrjfen6pmt6b2vaj1h20j/13751303740.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/dtscmojrd2tcr2jpva87at0dv4/pemukozafafatavez.pdfIn PDF document text
    • http://funperm.ru/content/file/44303100977.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc675326f5---91925179790.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/57fc04f67b0f55bc79f1332554911484/birivefobukodujasi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8h00dutvhkkk24s0mbt2s0i7p8/32229681270.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/8578517090.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/34016163e4a62844a21bd895c67bd3de/morij.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d550b0b329---filonoro.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56d1a94f81---rixapatolixevekujenoja.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9e070728---vasawirobeb.pdfIn PDF document text
    • https://raljob.com/userfiles/file/bozefejebo.pdfIn PDF document text
    • http://plncse.hu/php_data/file/33890923647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=asterisk+server+configuration+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_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 19204 bytes
SHA-256: e4cb80c587535f41db02518811b15149b6b0ddb82bc8b27b790119a5f5590a63
font_01_sfnt_off000156c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EDE 10988 bytes
SHA-256: 2083c3d8c466c2593046e32b1991803d9164c1b6fa4cfaf36b7f7f2b76f4ff0d

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