Malicious PDF — malware analysis report

Static analysis result for SHA-256 f233a6d4e69625bb…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 00:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a83bd63229a7d857de3dd53a8cfdc43 SHA-1: b12b043179de61e54442a13ce593ab8980b271f8 SHA-256: f233a6d4e69625bb050acdb2e6c6e6f0c9156adc53166eb6aa95c45525d55d8a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure, likely intended to deceive users into clicking a link. The document contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 68 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 https://pixomot.ru/uplcv?utm_term=android+10+show+date+in+status+bar PDF link annotation
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/cef1865212b5a0f0a8fb19aa0735228a/keramovowezulen.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/07ffb10ae46d8b1a8d06bf0fe48090ff/gadotetukuxalabunakit.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/jagasuseroparoneg.pdfIn PDF document text
    • http://torgoborud.org/images/file/danak.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/latisazidasipano.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/44015697016.pdfIn PDF document text
    • http://rideco.hu/upload/file/tuzebuvozazorunavu.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/bigatu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/338b686b6a7a8a0900ee8f8a91b576e2/74672233971.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/zigazizopaposama.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/sejixonozosexikef.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/kujipuz.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/sanoxuraban.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/89619694841.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/lalegedijozipezobenakigi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312d05c53d2---69775339592.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/33374607863.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/35843727587.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/11752407908.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/1270962808.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_off0000aed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EB 13968 bytes
SHA-256: 3aac3041d1cb05d54d10b2921256ac2be50da24d8d950ebfc639f93b01e52f4c
font_02_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 10780 bytes
SHA-256: 5adf8ee734c91b5f72ece5716e248489d971028f95d60fb5dbfc4055d9703feb

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