Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5e7158bfb77add…

MALICIOUS

PDF

94.5 KB Created: 2021-08-10 13:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6b8cc06bcf5c0dfd8fc6a88d62ba394 SHA-1: f963c85fc894d883db9a9e046d1bc5512cfb7dee SHA-256: fa5e7158bfb77addbb322d4769b3f20eebeed87c27101a21d997fe49926ace9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://austarpharma.com/upload/files/21285801299.pdf In PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4cc5a266d49c02f6a5449c54bd55b4ba/bafeguka.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/1m1fk1vfei8ifsgf6aq9f8oge2/15374697048.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070491326106---64254995732.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/buredonuriwoxepalukup.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/96585359350.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ae72a620bc0ad9be6b6c74e43ba7757a/senixezajotufisopi.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a658e027---diwiresolagopapobakomod.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cbac0e6f061d4d0eb2ec67d8b0bd3088/lupotagonopuragifexoso.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/lununagujidotawezige.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/1dd00f980e4af19472481b05edc6e92e/99851020834.pdfIn PDF document text
    • http://3q1p.com/upload/file/210623040617548876mb2hvifg40c5.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/wajate.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7da127e97---nifiwufuruduwoxi.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///32601427254.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/22811130659.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4b3074e7e7d00bfacfb7e6e89885c814/99720846653.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/37434e55c7519975581d660d6fa98ec7/taxuluremetijos.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/paximobimeto.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7fpf00l56l6gk4fhe85a9lm353/18399838349.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/panusidanijebubifexeki.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c350cc26---tuvawile.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/4142825773.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/votenowogazirevise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=graphing+parabolas+worksheet+algebra+2+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 18052 bytes
SHA-256: e1a56863ba7c50560b78675ff7f5f3f0ba075c7408c7013820c8bae49a299807
font_02_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 17740 bytes
SHA-256: ad83af06ae37d101c4ab851186d7d407aeec455ec1c3dbc151713d5dec64c3eb
font_03_sfnt_off00015181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15181 11124 bytes
SHA-256: 18027d4ff0f54c6a01eb29db275590f38a70326351046832fcdf4a3e33338777