Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66807d86f3c616a…

MALICIOUS

PDF

70.0 KB Created: 2021-09-19 02:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 357c36f0ff49c482cc54c6adec13d32b SHA-1: 56c28e82875368e56297d82a76b12f0141c7d759 SHA-256: c66807d86f3c616a92d6efddfed7b6997724918350e86d9243523f3b3a2eb493
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://liveisagenix.com/ckfinder/userfiles/files/fumoter.pdf In PDF document text
    • http://capital96.com/userfiles/file/6403933280.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/30841732643.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/41828978609.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614562720589f---78268702960.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/ziroson.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/42655015878.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af4a72b03---64957168566.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/legerapepisifa.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/17099370730.pdfIn PDF document text
    • http://irollee.com/userfiles/file/5750522380.pdfIn PDF document text
    • https://dm288.rs/slicice/file/fobekupafejeguvokun.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/zejixifav.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/85112366614.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/88074884286.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/66847717022.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/66094661645.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/solijazogozomifegavowot.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/18689278750.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613333b61ab23---24698727634.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/zilizuxuxufufe.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/bepaximosogemij.pdfIn PDF document text
    • http://fullx.net/files/84629787312.pdfIn PDF document text
    • http://195exim.com/datas/files/zimajuj.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/95284202073.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c993a4c0f---pujojude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=puzzles+for+students+with+answers+pdfPDF link annotation
    • 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_off0000b3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D0 10840 bytes
SHA-256: f18e231a8d340acc3042c333a05a29a99d0d18ae8cc8beafe0863d33a0633494
font_01_sfnt_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 14980 bytes
SHA-256: af6dbfe740c826414ce7b6272ed2b969095976e3bd668988aaa0baf5f792e85a
font_02_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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