Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c1ca913842ce3c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 11:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fa06710d511570308beb965711944781 SHA-1: 4b064505d5ec43e442444b389a274a1817bf4a3d SHA-256: 31c1ca913842ce3cb4350f5a83742ecf82bc06a8cf1116392227f93408f0fb6e
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a 'Callback phishing phone lure' heuristic indicates the document likely prompts the user to call a fraudulent number. The document also contains numerous links to potentially compromised websites, suggesting a phishing or scam attempt. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hijaustabilo.com/contents/files/meketiruvututamixawoz.pdf In PDF document text
    • http://stigstudiotecnico.it/userfiles/files/14936897012.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161346c137a739---92266151072.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/20196862501.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/98979639652.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/tezibuxori.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631912317_692d7ee351.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/90979108651.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142abd0b8658---91866858706.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/87483788301.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/60120564651.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/23063299889.pdfIn PDF document text
    • http://nscenter.cn/upload/files/3826705557.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/2c4304e7de057be67f9f7bc90d7f745a/vixobuvefozaje.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/soridikufopalixu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9qustjlt8s02n25ur8kl2r6cfs/fuvonutamagojewoba.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/69695884283.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/883766435.pdfIn PDF document text
    • https://clinicscrm.com/img/files/natagabizeru.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/12523494990.pdfIn PDF document text
    • http://bibikid.ru/upload/vojowukutonelabovevibofag.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/60191577740.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zurikexobexulonewerika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=can+i+have+imessage+on+androidPDF 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_off0000c256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC256 17208 bytes
SHA-256: f127f271bbb72980a96349a2214b21db94c17082b420420caa15a0a3838c6c7a
font_01_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 10648 bytes
SHA-256: a4088bad7806b9fa07f6b56d08d36e7d7a0bbd4ae06611a189a6af33628915a4
font_02_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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