Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8c69ff47b3345c…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 09:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd67f375fb9b1e64225cc222c525b2f SHA-1: ca775484e25b4658f11dade01f1a4687cab5ee3a SHA-256: ed8c69ff47b3345cd6f597fa9037529e682f2313306a7de2952080d64c814490
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting and compromised CMS uploads suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b76a2034---62271809103.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f032958b---dinasuvalupebatutu.pdf
    • https://alice-immo.com/userfiles/file/kagutotuzedubiko.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a9fac0a96---61576167589.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243df672f8---11471133186.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902f853b2d9---novoxatusomoxatotofes.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2d7e359f6---lenulupatuva.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e06d086bc---75467261058.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b32bce37---87911141563.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qfvsf34bu4nb9kcqa2jn1aokj0/fofovobiwepowepal.pdf
    • https://careersourceokaloosawalton.com/files/public/dedevesikojobaworujog.pdf
    • http://eltonltd.ru/sites/default/files/uploads/52748934031.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7e06bc10---46759913745.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f845dbe307---85357518921.pdf
    • https://ferropula.hr/files/tafebefobibin.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816bb53c43a---14810509625.pdf
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/91734fe2f878d2047f42a867805ff5a9/54012131831.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de90e34575---59377384831.pdf
    • http://webinside.pl/userfiles/file/77366417118.pdf
    • http://atek-ent.com/upload/file/80696925376.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0d26440811be5d94627fe83a04ef850a/15691683592.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a248e29f79d---sijiduzuvanazinapij.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1dda43f1f3---nodopeveguzutezadi.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1a4e7f83f---7817879414.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f59598f0b---xawati.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=food+deserts+in+chicago+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
font_01_sfnt_off00010915.bin
f4be6a4aec50146cdc471397dba468d7d210ecef24083eaf7ac06b358c564833
pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 10820 bytes
font_02_sfnt_off000121cb.bin
68d8e8111916108eec928b678e0fc4d2c47a797c7866542db0262a777b95fd2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 16948 bytes