Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f1eccc044d74ff…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 15:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c0d651ea0ae31faeda69247c13eb8ab SHA-1: 8ecfba159b919d8e42c212b3009cbd783729a879 SHA-256: 13f1eccc044d74ff29b6b0556c711ea789da920fa97706ba4dc015705c8d7e29
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'callback phishing phone lure' heuristic further indicates a potential scam or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=ciash+of+cians+apk PDF link annotation
    • http://candientushinko.com/images/file/37193074417.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/35460547737.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d4b039a3---20961475013.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xajixabefedugasarudopej.pdfIn PDF document text
    • http://land89.com/ckupload/files/taxareta.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/50561765869.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/galodunadelox.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/17242463282.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/35642690868.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/kabutosawifepip.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/4059310044.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/fabazelamezanosij.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/32393618726.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/59809746972.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/worowodabaluvu.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/70482780294.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/35362787844.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613437aa35053---98775981097.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/2646114040.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/dodaxawapaxevavugajebixa.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6cc450e12---62532908003.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4d5d52fb---paxisi.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/46047923151.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/sezivixagewidadov.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_off0000b970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB970 16264 bytes
SHA-256: df94743c2466cfc3412410254dc3830af4e629d4f4870437e009fc31c64df8fb
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 10324 bytes
SHA-256: c7e3a1b7d2460c1cd064992ea912a5b72b6f2bab8d4cb026ee0d23103f9c336a
font_02_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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