Malicious PDF — malware analysis report

Static analysis result for SHA-256 1571199fe7b9ce7e…

MALICIOUS

PDF

101.7 KB Created: 2021-09-01 17:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c281029d8debfd1820d56ff85e9609bb SHA-1: 9844c0b8174f39237fd13a60700cfdc3267ab6ef SHA-256: 1571199fe7b9ce7e2d0fa2bf20068b5c8b0b4b327d8e95d0c92b09bd0af12499
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=combined+cycle+power+plant+working+principle+pdf PDF link annotation
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/6809727644.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/xaxoravewapikupeziwab.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2605585c2b---xejadidafazakax.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/gukafuxorapuduxizev.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ed468a711---xekovawize.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/gotasaxomawemekumoxodo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5b92920e---56573105952.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/77187944480.pdfIn PDF document text
    • http://synowka.pl/galeria/file/kubesipeponupokinup.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/wuvidikepapogapodalepag.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vilugozituweket.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca80adb1e---bobupulesuboxifabuxipux.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/7fa3f521d056bd49af5eedd8085d0611/72837847293.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4ed1852da1b3070da6c25a9885ce9b8e/32908406334.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/58327442816.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/biwutixorose.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/jedafatugezetasu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/64178183624.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pomubajomuzur.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/batazajawadagitamijawiri.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/jqa230bfkgbe9oad9qde4k26mt/jixoberojunurizanux.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/5453741648.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/4232752335.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_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC3 11256 bytes
SHA-256: 1ec6346475ba8621ee085590dffe4f3a4f90773933cd2f955c3dba5557375d28
font_02_sfnt_off000155cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155CC 19400 bytes
SHA-256: de973c3d8bbc9851e52ef1c91882fedd8e9cd40a27ea56d297fc2b4fb5c1d8c1

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