Malicious PDF — malware analysis report

Static analysis result for SHA-256 4231825fd225d2e0…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 15:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cba5cff6affbb304018ada583442351b SHA-1: 95b9d413ed0989b88764abba9673af57f333665a SHA-256: 4231825fd225d2e0a5a7eb3e8d9928561dafe47402ca6c422858f3ebd6558c6e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and ML classifiers as malicious, specifically as a phishing or trojan delivery mechanism. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in tech support scams or refund/billing fraud schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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) or Microsoft license-boilerplate 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://crysiq.ru/uplcv?utm_term=mouldy+shower+curtain PDF link annotation
    • http://sun-green.be/ckfinder/userfiles/files/dovubaxomonu.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/54357380369.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210625_a0fcc.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af039341a---25061059194.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/04a581e93d9d8d2de95392ba43fc8b33/782204986.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2fc42485b6537c05dcbd8220a55c1924/35361603664.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e620d23ec---bimikuvuriduxopogituxifo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91f68b25d4---zarovupuzab.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/uiun6hhsub8r15thnuqq7aqeg7/85962938509.pdfIn PDF document text
    • http://nature-revive.org/files/file/norotovob.pdfIn PDF document text
    • http://charontrade.hu/data/file/betusifoz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ae699ee9d995560ae168524a0eb06805/biped.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l4gka6dr84lt2lg3qem5kai2c7/5954179407.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607140f3d168c---37711627025.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2b93421860620fbda8bcdd5ff2b2e03f/45194182791.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/10143360730.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/a11ca2505265ce19c911de94c1dce868/vesuvujabonopaxupunesidet.pdfIn PDF document text
    • http://01host.ru/userfiles/files/14924370126.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c59809912a---falimom.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/daduxalozoma.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/bebariterijosopi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/7ugc906jdjhge40imcgb2l014b/lekevenite.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c49574e94d7---ziwaf.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/17924ea89b956e4c88b8f54196c05a5d/52055518676.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/58069654400.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_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 17544 bytes
SHA-256: 9527bebe9c0536cc2ad2ea93c7a0e6acb741390ef18c7043793d50d627c5be96
font_01_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 10760 bytes
SHA-256: 659502af153e21db36442985197ece90384ff888001d805903db13898d9526f7

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