Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef6965881d56e20…

MALICIOUS

PDF

62.5 KB Created: 2021-08-29 07:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a83691ddbab45e36e8f77e113dda67bf SHA-1: 05afe2293a903ad76a900d7e9c07933db9d10b30 SHA-256: 4ef6965881d56e202782541a62b14d13dc0c5740d67a27ab15ddef8f406a2385
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9580

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=what+is+a+multinational+organisation PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eedec7ff57---50657223859.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/wajobizuwulurafilitor.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada090a5bb9---30562331297.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcae9123760---poratedorodim.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/de32ef58d6eb9c54f1d9435390b45458/85341793157.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8168f329a---14996470691.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ad442c7cc---kepidipimanubulupovu.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/kaferaxosozasiw.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/12547501262.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/toxizage.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/zokojizimakizesifuwekaxuk.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11580655f---60673545783.pdfIn PDF document text
    • https://inncredel.com/uploads/41432514147.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/majefatanemakubanox.pdfIn PDF document text
    • http://email-database.info/userfiles/file/wekasitonewa.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/nemimowawagakoxusenoxajig.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lvl24jsf9t8tjk5skumcsrhsqb/47559993763.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716d1273e8b---41996889519.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/13048281181.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/npbhu5fenc45g2sjqgue2shhp6/falaboka.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609471f317b90---beposaxumelikajudila.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 10516 bytes
SHA-256: 98b60e21f11ac1fb204acd71d616ebbfadea2fed48569f3d328fe2c0979dfcfc
font_01_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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