Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c570d48091debb5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 00:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d94c3de360cf32bceaa04a7721e58099 SHA-1: 6a692c0857c4d6dae69dc0c3e46b7c7eaafc216b SHA-256: 6c570d48091debb5e7bd769f08d7bbeaadab7c728f23ec110dce91f5a1984ee8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple external URIs and the nature of the heuristics strongly indicate a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=how+to+increase+sd+card+memory+in+android PDF link annotation
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/52889602349.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xeweviripimigowawupodu.pdfIn PDF document text
    • http://forti.in/userfiles/file/31924751323.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/69875081179.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/koxiwijun.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/vikati.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/jofaxikinowujij.pdfIn PDF document text
    • http://cochemical.com/upload/files/luzisawirox.pdfIn PDF document text
    • http://chamdure.com/DATA/files/47754216313.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e68fb427b---22257523545.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/68766181041.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d42d3469d75760ccefa9a5156f483c0b/lininajawalul.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/17887268380.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/fosigawi.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/luruvemovobaronito.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/rusexotajezelirenewiz.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c359c7b07448a5a20086cfaa8e06be78/malemuwosananumudo.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/kosometidewizixif.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wopikakoxesepudoxujibu.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/bumibevaxakalakafekub.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/83704939702.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/wuvidotutux.pdfIn PDF document text
    • http://change4best.ru/upload/file/71109338421.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/46167919566.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10676 bytes
SHA-256: ec252c05f523dd2fd7d116d96dcb7f0f4f70b1285fc7388042c80569858ab4c2
font_02_sfnt_off000110ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AC 19532 bytes
SHA-256: 2a8504b7f1fcb484ec7eaaebb9d5a44ea955afff8be84851b9231912071c2a8d

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