Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ce261af6bcf84d…

MALICIOUS

PDF

134.4 KB Created: 2021-06-28 07:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d863d2df8e38eb35c76556aafac81e40 SHA-1: 73ab78360f475015265e1090aa01a5a63b195d7a SHA-256: 50ce261af6bcf84de44bba0039d784e46f0103d933b0877228e573981e986bf8
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75f7803de4---24585267843.pdf
    • https://dienlanhhonganh.com/images/pic/file/28014695091.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607463d1a1c18---wumimuwi.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b48afd50---65755599918.pdf
    • http://josephlillianmorrisfamily.com/clients/59960/File/jelivasof.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a696c596af8---92057999736.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfe516838c---bujoganavefebudufo.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/uql73d287opeooc8hmntjus7a0/xuzenubumexelewemanexo.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/seponapuveraxowagabujidun.pdf
    • http://arohitourandtravels.com/userfiles/file/pukasafu.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d4d629c4---difidilitujejiba.pdf
    • https://tecnicadovolante.com/images/file/30251423054.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/60de85846a2ff319aaffc8a54fd1fda7/bakizekinovonup.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb646d096c---rotunavizemukalexoriduk.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074022064a77---molopesexiwevulumifug.pdf
    • http://donateagift.eu/userfiles/file/42355908798.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/0a4cf6840229b55ea97bfac7b79ccc00/jewurozi.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ocpun05sbf8e985m4he1dnug50/sopedatolupevorojimuwunax.pdf
    • https://beautyyaurient.com/editor_upload/file/wumeralupenejoja.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb9581f4e---77600541561.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u982fhoau5mv9i9t9mq4kta5p6/82247507503.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607906bf74bf9---gaxepubomujogaw.pdf
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6cb03dcc---buxinijekebi.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikodijapifiguregid.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d9b5cecccfd65e60c2d14a2c39d29c8/gedozozaliwasaluxixoji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=personal+goals+examples+for+students
    • 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_off0001ace9.bin
a393b718ae460578edb0647c5d76bc4d19f961f052b170439d3e6696c6907f96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE9 17304 bytes
font_01_sfnt_off0001da38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA38 16792 bytes
font_02_sfnt_off0001f24f.bin
73d189be3a737c70a89efbab7bb04cd5c1080a817afb0efa2dba8019d92451ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F24F 10952 bytes

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