Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f69e8749fe5f9f9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 20:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e53e3c90fa808c080b22b6a775ee9585 SHA-1: cfc80f1e73617b9abc385d52ca8a09076d953d56 SHA-256: 8f69e8749fe5f9f9b402cb1621e1749898ec67c42b496def97f4c5bc5ddd61c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 external PDF files hosted on various domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dansobentre.net/uploads/file/35654594229.pdf In PDF document text
    • http://booklandbooks.com/userfiles/file/38569041404.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/xanezukarebogedavufali.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2c0dlhv63vmu1j8nl8eva9nhb6/97750685603.pdfIn PDF document text
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/9016319764.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/327118153ad440f3369f0c3040f2d13a/pupigenozenunoveg.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/23793274372.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608352ebd3241---61014213713.pdfIn PDF document text
    • http://mopron.ru/upload/files/59240721754.pdfIn PDF document text
    • http://berbun.com/user_img/file/kezifomisedude.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/79110425293.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/fafurixisanoputinimogan.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/popemukuwunubomutovoki.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa43cd982a---33727791870.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nuvorawisafogarapif.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/furulererivamagunim.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/52287537558.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/ruwabopa.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/jujebofozilinilot.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a224555ad6---relezorakepasipexaxore.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a5ab947f32b075b14d20d113411a792c/zezakowuxamobasujatojage.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160795e558a048---tovepoputivosupikozi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c89c574894---74700287728.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ct+dmv+manual+bookPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 10348 bytes
SHA-256: ea8bba3bdadbece61319d0b2ae1c056c91f22c3aa9896a0136682b8dc9ffe096
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16908 bytes
SHA-256: f552062667dc53ff7c9113dbb9e6cc75f9e0226d533439a499f750e43626d292

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