Malicious PDF — malware analysis report

Static analysis result for SHA-256 36265928f288d54c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 06:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 184b66733dc596b711a6d08906ab9496 SHA-1: 381236fc6237c540b2780d5c1487138b596d3dd8 SHA-256: 36265928f288d54c1e382cc431e5907fef1a8d017d3c4f6c87b2de994d157af8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, some pointing to compromised CMS upload storage, suggests a link farm designed to host or redirect to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely contains a phone number for a fraudulent support or billing scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396062ce679---saxekarovukugosidiv.pdf In PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/kudigikunigiwubonizomemuz.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/difexubarekubegorebom.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/6948680642.pdfIn PDF document text
    • https://activepymes.com/pub/file/razebikivukobiruwidape.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wizupidipitugufenekojena.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/71939864442.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zowuziwokapolunidinoxeda.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///82865766014.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143124a9d31f---7062795697.pdfIn PDF document text
    • https://aaaxxion.info/images/file/koraxor.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/zutujatedisopajav.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/kigozanivov.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/farar.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/xatuxereveza.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109051517219234.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///sibiredakavidesuxev.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/lubufubesuf.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143679340226---86634391792.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/zonigaviti.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/95033256560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=star+iptv+apk+downloadPDF 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_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 20284 bytes
SHA-256: 45f5e528c388c8aef549dfb794849e705ac8826567723ae32cadc66e1012e772
font_01_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 10404 bytes
SHA-256: e57462a234c9b872a822377d87d3f9ace4d2b60ce8eef4b39fd7a327997f1a32

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