Malicious PDF — malware analysis report

Static analysis result for SHA-256 660c6bc180a5a06a…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 17:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 080d08209fc1a7d428344efae35f7780 SHA-1: 7ced3cfa731535c1ca2b20508dbd822305ee83cf SHA-256: 660c6bc180a5a06a06ea6bf1e87805a193e68e59e951d5278511dfc9bc67b434
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest a lure related to software downloads, likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=flv+video+downloader+for+android PDF link annotation
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3022281c---24468574008.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/kejeritazisuxufowusiloze.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/48368250762.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/46791046305.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/mogexavevugibonimek.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/87962813667.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134afa894c70---kopovuden.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/betipulipiwipitapoti.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/51525226857.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/dozitav.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xosunepovove.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/92584840019.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/50053659448.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/48146222029.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/vejatew.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/karagirekamuxelitugi.pdfIn PDF document text
    • http://e-sportis.com/images/upload/47511255041.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobosogi.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210908075908.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/kopipevaxutosejalalexibo.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/1112211970.pdfIn PDF document text
    • http://jarosi.hu/files/file/tipod.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/43cgmd8sbqilftu39lr27ku59q/25819418238.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/gezewakojivixinupe.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210903134347400.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_off0000c5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C8 10212 bytes
SHA-256: e1d97f8821674981b754e9c2d6a2e4f8927b5e7708400ee29bddf405f7988533
font_01_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 17076 bytes
SHA-256: e58de08af37a56c399ebd582bee15c03802cad58643d8aaafb37362511651cb4

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