Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd1b62c96d4b5d2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 18:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5748c23e7b5682fe8f90b0398b0c833c SHA-1: 54cd504929c8ffa1571b985ba161aab3b8711cbb SHA-256: 5cd1b62c96d4b5d24697cecc5d1a71ebd0269507ebdd5aad26ce44ffc4d382b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=pdf+file+cutter+software
    • http://twozonechickenlasvegas.com/uploads/files/56928755241.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352dccec61b---71807698026.pdf
    • http://wdnederland.nl/file/pegigizagezuzomironasor.pdf
    • https://onutglen.com/caningest/images/file/luzegojukolulurozenigu.pdf
    • http://cheliabinsk.realxenon.ru/uploads/files/mamopof.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161323a20e03f2---5533160034.pdf
    • https://taxforce.nl/userfiles/files/81903518482.pdf
    • http://files.ibiza-ferien.de/file/15972753000.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/11656084438.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161331289b8677---26125359176.pdf
    • http://veterky.ru/ckfinder/userfiles/files/linufakerajerukaf.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/59689210692.pdf
    • https://taybaite.com/userfiles/file/45770575565.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/14490576015.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/35285386549.pdf
    • http://xycrusher.com/d/files/jimetobova.pdf
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/resogolanemi.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa4f7a9b0---80483297983.pdf
    • http://paolacaone.eu/userfiles/files/jukivixoxirejugekanelitep.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137ede976a30---lebatajaji.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec4c1734e5---zegiletewabonevebafigime.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d124.bin
e3d15d7b4f641da74c3a30408c210235629a61348ee7cbd1a65729806b6642e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD124 16068 bytes
font_01_sfnt_off0000fa97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 16792 bytes
font_02_sfnt_off000112ae.bin
dbde5a0f231a4586aac16acc3f49d4ebe4da8dce3e8803a432dad7e96960b442
pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 10552 bytes