Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eec3f45509372dd…

MALICIOUS

PDF

82.8 KB Created: 2021-08-18 13:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db3b25d2c22b84c6be10813bba565ac1 SHA-1: a795a6320e0b7b4c53559e01ad213bc30be14b57 SHA-256: 7eec3f45509372dd13aef2dfffdd1b9d6c744e6d3d695c7daa112385dfee4ad4
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 an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains. These links likely serve to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/uplcv?utm_term=how+to+convert+multiple+images+into+one+pdf PDF link annotation
    • http://dakmet.pl/upload/kanazuwulat.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/77237626103.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e359e3a78---57162185144.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/v1vvfs2j69lg55vlc27j7b2n6d/tudap.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/dajimifodenezanutexinowuj.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/592972823.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0355ac37f8---76595527826.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210815_1EF45DA9DAA03B1C.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/99274bf8df9a50708b56acc3a328c6d9/runefitulamo.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac243ed49---dofetijokubirafufibab.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac89010daa1---35296473112.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dfef99960---zaxomibizoluvevo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e30b589da6aa8e1f2a7c22d199b80d0/wugemapuk.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/62483814373.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d456d3ab53---10744913568.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/34413238030.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1921a674---wopumebemavi.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/sewefazotope.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/polovawazivosuxugiru.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/nirilijoreli.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160806b5f1610a---rakegusawef.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/disuliwuzosor.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fb6fa290f---50777053011.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vexutaluk.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_off0000dddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDC 17188 bytes
SHA-256: 922c3f3891b6578513b7bd6005aeff86e70a47a6f7c0dcd8cfe00c954fd4528c
font_01_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 11204 bytes
SHA-256: 75fb4283eadd873e963925457cb0b10389f0ea62aec3fe245503524bf0199232

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