Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fefccbc7309dba6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-17 15:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3aec0fbd3865b1b520401f899abac847 SHA-1: 91e72cefafc9daa26f4e245e240274be7589a3ec SHA-256: 8fefccbc7309dba6734970d919450891ee5f6acd23d333d02cdfa5b39a254afb
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on disposable or compromised domains, indicative of a link farm designed to redirect users to malicious content. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely for phishing or malware delivery. The heuristic 'SE_CALLBACK_LURE' also points to social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://worldpigment.com/image/upload/File/givadaraxusiruri.pdf In PDF document text
    • http://akvari-um.ru/userfiles/file/64958086260.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/92145956880.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/35221102449.pdfIn PDF document text
    • http://intertribo.sk/files/jedexabokafamasepo.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/tuvovaka.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29694119378.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/tuxozuxoz.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e907a260f---71517522713.pdfIn PDF document text
    • https://ms02bet.com/contents/files/12650344584.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/17944269993.pdfIn PDF document text
    • http://hanifeugur.com/image/files/17550661702.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/garuduxemixazokemudimapi.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/malikuvakotunotaxuwekaz.pdfIn PDF document text
    • http://actinq.nl/upload/file/95623232838.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/72225110608.pdfIn PDF document text
    • http://suurelepa.ee/data/file/54430877814.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/teganejal.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/68737773421.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeec028502---viwolav.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/519151642.pdfIn PDF document text
    • http://dsfly.com/uploads/files/79096229480.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/d74c6e8805b9021658fe3a59878e0989/fonevojikev.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/81773845067.pdfIn PDF document text
    • http://identik.hu/editor_up/87910463664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=psychometric+book+pdfPDF 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 10920 bytes
SHA-256: 99e54681a1868d23e7295664148671bfa2a04dea217fb98e6e216b9bf5710cb2
font_01_sfnt_off0000cd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD62 17116 bytes
SHA-256: a2519d573bc2176d65aff3f0ca633cd0560f1d8561a0ad8d3cdbc4aa68ccbce8
font_02_sfnt_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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