Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60e6685a4eb2cb8…

MALICIOUS

PDF

103.5 KB Created: 2021-07-29 22:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d016edd4f9cbf3ded7e509cae6584aa2 SHA-1: 4a28da5005738d94f12a76f315091f822f020b32 SHA-256: a60e6685a4eb2cb8b3736599bae553d61007ee4f2d9f4bdc235b4ec0428fd34b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress sites, suggesting it's part of a phishing campaign. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a social engineering attempt to trick the user into initiating a phone call, likely for financial fraud or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9942809e8f5c20ef1498c7143332990d/82761230867.pdf In PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d9e5085f8---96789420251.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/90fe7dd1266d52dcc28835acad8efa6b/68987788701.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/58988933199.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f562427563c---fegenisonituk.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/18417849078.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9c8899a1---65385371342.pdfIn PDF document text
    • http://kasargod.net/uploads/file/71632792477.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/mimadelaxitavafoz.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/vabevitidojejutedonat.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/rezox.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075453c5a439---16915333037.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/6io8ge5v2168adjtjq7gmmcgmf/xuxalaxulejokuz.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933454c827d---tedul.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f79cec7eb2d---81542306704.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/32988580815.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/48418653624.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad664bcf26c---tivedanedotejav.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3ad9ea9f---bawam.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bfd030003---nevukatusakufopiwewut.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e994f84c89097f9c3b1b5967ed711dd4/76848899532.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/363d5c8108aabb0bd3310d8903187833/simirekipuvuserejera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=warriors+of+waterdeep+hero+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_off00012f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000147b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B1 17964 bytes
SHA-256: f42f39065309b167fe3261c0b58018abac2367116bc187f09379681028a4f18f
font_02_sfnt_off000176dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176DC 10804 bytes
SHA-256: 7f9fb4c2d7b463ac058e1015f5dc9f296bfe465e5f668f3cc355735434a5bd6b

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