Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4a11c95ac47e45…

MALICIOUS

PDF

83.6 KB Created: 2021-07-03 09:36:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43450e337a986acb012ef7fdccf39e68 SHA-1: 3af54b105be1b8c02971ddddaeea1824075cd4d5 SHA-256: 6d4a11c95ac47e451f9f4588e5305fc0d178a0b61661388382508e0e5f41a598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=young+adult+naturists PDF link annotation
    • http://fields-on-earth.com/22752894689.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/malesewanodiduwemijuma.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/988516153894e75757112a261cce7fe6/gonakuledoguzigan.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef8039767---lezosugu.pdfIn PDF document text
    • https://khanikango.in/file/ganebekesoxatuzisanatali.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a115fca396c6fd3c79eb99372ff946ad/12322584442.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/onuf4p54kheda6tdp8ie7gg9uk/sawasilijudupigusogu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a883cb6a996---jumifaxajutumibu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3b1a491e173452b90dad963ba1a0b0f2/jowajatozipidan.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/jrtb3q1kfptse8k5ds8cshjer0/88837837676.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/sevinunu.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/vopavupewexuvidikajesuxo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/94435187850.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb0155853---12132878371.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c875d784---jajogokulizetudevetid.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/wunijutuwebit.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5e236324d---sibimalamiga.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ccb2df5f26f35605baa426ea0bad7a0f/32466526340.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/nekigofepajali.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/93190734059.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/15124617809.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/13j2ati7053dncd9ggej0jndul/jejim.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3e1d30bbfespn5tqfab37g19sj/guvaneloxol.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bf9fab8413e6422adf906bdf00f8fc4c/gotinakufimo.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/99f7f35b6bb039a945521f4300a47152/balusosagowemuwivi.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_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 17596 bytes
SHA-256: 67599e0f9a149a8efa8deadfe4d99f717b69cf52ba21c66436cdb4cd87424ed6
font_01_sfnt_off000111ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 10376 bytes
SHA-256: b30a0f336cc5322f3e896c3e912f91459fd399ee988272aeb6f606004ed27375