Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d35cc50383e03f6…

MALICIOUS

PDF

101.9 KB Created: 2021-10-06 22:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 56c487f14b832515f1364450a94f27cc SHA-1: 116ee405742ea22182baa8c648fb702450f04176 SHA-256: 1d35cc50383e03f634726ef549224051c041c83c69277802f39373afdcff37a6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or are structured as link farms on disposable hosting. The presence of these links suggests the primary intent is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=reading+answers+of+cod+in+trouble PDF link annotation
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/59620165212.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nilazinud.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/kofamajej.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142afc799d0f---misina.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pateb.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/nototaj.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2631364b---vefazinemezelaresil.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/92584840019.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156244e45381---wimerudezaxekixe.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/614f73b449f17.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gozagukeke.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/16605385488.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/69138976435.pdfIn PDF document text
    • http://marupi.de/UserFiles/File/razegivilemevixova.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/58103517399.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/97417498512.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/12472401369.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/80924241995.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/marurorelikikinogatu.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/sanexofixevatumu.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/vosemurowut.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ereie9r21d724tnkci1m04rnv7/jatuxulusatabamaradibuvo.pdfIn PDF document text
    • 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_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFC 20396 bytes
SHA-256: d8e7bb147562ed4f87f531e12853ecb921c38897f79055f3231c436b89552887
font_02_sfnt_off0001707c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707C 11020 bytes
SHA-256: d304dca6a24a7aa2bac6837c2c40023f12735247920bf11d2533ec0800f2ff5f