Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30b7c299d5d6955…

MALICIOUS

PDF

126.2 KB Created: 2021-09-04 07:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c905b7627b87ada946e334da69b03613 SHA-1: 1082e2a5eb4a418d13f3b7510bb23e5f4d5fc2bd SHA-256: d30b7c299d5d6955691fce9c44f56956a6d07e771b14764dea11cdf85c235f80
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised WordPress upload storage. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's purpose is to trick the user into calling a fraudulent number, consistent with tech-support scams or callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626121596.pdf In PDF document text
    • http://siamsankyo.com/Uploads/file/bidozesevaripipozi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/dejawotapo.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///mezofagixodadobozi.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/latiraluguzorawazej.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5998a6ba358a51a361a9d9b7de268308/gumusaturixepisiven.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/mujuduzep.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0d90601cbcb2b65c8257aaeff1104df1/rogiwizajuramope.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/ruletemosoxovo.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210809_1178AE0D93E8D5D3.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/wuxazefafifuniwasomuto.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/38926707030.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bc48456da2c---94901819847.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/43493326019.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/m647isafaq62tfujp2ijpt4n82/61095188347.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093d446a8d93---79174890569.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/vuverajukot.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/82357821857.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/1739759400.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5baf27cf20---maziwotavuviniwafamid.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067b9710ae2---dosigawafuri.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481a0dda22---77486360778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kriya+yoga+pdf+booksPDF 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_off0001880a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1880A 19980 bytes
SHA-256: ac5f3510b2f6c22db0f49623a841b9e620bf88b4a7679d5ecbafcb861f309310
font_01_sfnt_off0001bb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D33A 10628 bytes
SHA-256: dde07ed7cd97e7893821bfe71e5df6cc7099f9b5d6ff6c80ee36b51e3ec17c04

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