Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a9b3f5cb74ba366…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 12:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e298a5175db1085de994ac3a66c9b1df SHA-1: e3fb01f1a6a3989eaab5aa5e9b280c7e5d6a8e3a SHA-256: 2a9b3f5cb74ba3662c4a1071cc469a0ebab39e88a8c0a57cf97d5dfb22adb392
176 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. 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 callback phishing. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://coreaad.com/DreamDataUpload/file/keretenonumitaline.pdf In PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074169508953---37590581832.pdfIn PDF document text
    • http://bwc.lt/i/3963867058.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/45878583082.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/76836332420.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/54802107215.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e1683501cb39611810d80033599656cb/bugesokamopatazo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfd8b57ad0---jogifinotar.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/volebaxupadonisoros.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/29483776227.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b5ee7e5c69---dasinil.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0g3ci87clv0pp4m9icpuv0mcc0/29447677357.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/75573171058.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/80bdf935a4452a3c5ec36e0e879dc108/mekixovutezi.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/61154617795.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc9cd7718---12202381828.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/a5b7a96852197fccee36d1cf5e41c469/vedomex.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831be57b34---33973946849.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/lezod.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/kaximubaz.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/bogumabokesesu.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a6607edf5d551d4f2d9660bc0531f6d8/ratumixanobikezi.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/zojuweri.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/29418455437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=free+reading+comprehension+worksheets+for+8th+grade+with+answersPDF 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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 17616 bytes
SHA-256: 42b5f306dd469776b79b5c00f010772b6392550758efe712c64cf704178a61f0
font_01_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 11384 bytes
SHA-256: e51b5482389b4a4901d4526020a929d4bec506d3fabe5b6c6ae7cd8151640c29
font_02_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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