Malicious PDF — malware analysis report

Static analysis result for SHA-256 18608d6e5b1f49b7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 12:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9ddf268deca8d69b6584e806f679679 SHA-1: 669cc2db14fa8016efc64e1087720444aab0a27a SHA-256: 18608d6e5b1f49b7e34ab78f2f8332376053b1fdc49aaa38d298dd4ad37a4c0a
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a lure for remote support tools. The embedded URLs suggest a phishing or social engineering attempt to trick users into downloading or connecting to potentially malicious software. No scripts were extracted, but the overall pattern points to a social engineering attack aiming for system access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c9b1bbba8df211c4dfaf3481ac8770fb/28941681663.pdf In PDF document text
    • http://cl-metalparts.com/d/files/sekewobebudovit.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/sibixesolurideza.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/38184990558.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0e01447d---wosupebipuriwuferebanemo.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/minobubofanedi.pdfIn PDF document text
    • http://sungder.com/upload/58849264600.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/rikikerupimefipupa.pdfIn PDF document text
    • http://laserinnsbruck.com/static/49802750564.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/favopofipasiketumiv.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/12706562144.pdfIn PDF document text
    • http://grandfiltr.com/files/file/93959317201.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/mofilipelopumim.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/2d159feef89d123a20bcdf371e999fe0/81268795768.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134d5d5b1bb8---neneragozawovabitajuvapev.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/61484069571.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/manizawibaka.pdfIn PDF document text
    • https://emmaushuis.org/pages/fetevosumefokesazopovave.pdfIn PDF document text
    • http://newcityhk.com/userfiles/58454512585.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/sinuwufodonenuvaxosax.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/56645003150.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/61712690155.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/35040220227.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/03/file/20210903_073015_159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mobile+tracker+software+free+download+androidPDF 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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 17496 bytes
SHA-256: 56630facbfd53994c3364e7cf0d9be1277bc05719a8864e2ea7c3d554d9e52f6
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10780 bytes
SHA-256: 2625d01cba77c145bccef32793c701cd6b7d90b78f37e6b80982b777233479b4
font_02_sfnt_off00012274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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