Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2f6f9ee634f708d…

MALICIOUS

PDF

67.2 KB Created: 2021-09-26 08:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2533663e251a41c11822c3f3f1882c0 SHA-1: 9087f64152a701a1f5ec2e56acb7265082deda80 SHA-256: e2f6f9ee634f708dd56f3865cc0e098a0370afa4ee72ef86b30b936df64e2cb8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous links pointing to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The document body is heavily obfuscated, but the presence of multiple external links and the PDF_IMAGE_LURE heuristic indicate a deceptive user-facing element designed to trick users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16145622e4e180---xanojojulusumepipimoveb.pdf In PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/pimovirexed.pdfIn PDF document text
    • http://chinalabware.ru/d/files/32614818629.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kobamakeduviboturak.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/3965356966.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/25925364707.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a5ff221ba---22877024823.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/kavekopawazifilazafora.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210914165332858312lwce2.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161419bbc0fa84---gujotajowiguloxa.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/dujaguzidegosafinepis.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4c664b21c---gefazuliguzusukojotikake.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/xofezifu.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/9482602487.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/xemaxuxowibebat.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e123c45a48---95059624016.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/kesip.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/6982549910.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/18193230016.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/23762009798.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/dutigujofepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chrome+update+91PDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/lokasi.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_off0000acad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAD 10596 bytes
SHA-256: 0d608df542b56723fcceec2920e4b7c7075bd6102b16540e3e616e395c0e1fd5
font_01_sfnt_off0000c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F1 13836 bytes
SHA-256: 52816c64757f13a60c2fd15c66bb1d668ffd42e44db45bdad314cf317a6e4b9c
font_02_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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