Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53592c626c34488…

MALICIOUS

PDF

83.2 KB Created: 2021-08-16 07:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c1f8b55598685b5b6a4b0217cd5422e8 SHA-1: 264275d65c6555e4cbd0c14963dc5bc86776a9d9 SHA-256: c53592c626c344881897de97106bcd0c2e24cf8164a9b2348c2c88b5fb0acafb
184 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. The presence of urgency and callback lures further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allaboutdowney.com/userimages/79414313537.pdf In PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/50785456265.pdfIn PDF document text
    • http://planetamama.ru/files/file/69032187965.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/10778014165.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/36038338814.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c34938c1f7---6842849992.pdfIn PDF document text
    • http://aquatherm-graz.at/files/89688410862.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a8c946e81b146545e1185635fe0be523/nagidozafubazok.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/82762191114.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/16889861924.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/ragasekavitatakakuwu.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/kbscfhq68da7vud0vpth00eo85/22839647187.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b470d79b27---dikebiralixemikodu.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/radogawi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b466ec79451---farofuwa.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160750a5bd3943---6878450288.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/wakedixolorilonebixibif.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160882e2354d81---jolerefinideso.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/735cddf442b373c9968cb3ec29be1166/98192734719.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d98ad2fd---66299906086.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/13924447070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=friday+night+tykes+episode+guidePDF 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_off0000df67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF67 17512 bytes
SHA-256: e0968ac6e87b3fbed2a4a72f5a9a6e53efb033603059c5d60628640b1bd3001c
font_01_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 10908 bytes
SHA-256: be937cbba9838bbd5cd4c1951d7ad87024ec51da50ff5b42031d13d2bce4e843

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