Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb59a517b0fd56a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-08 16:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f7b3b25b76b6f0de3b7ebefafaa0b8c SHA-1: f097772456f821c85e4aee9e3b0233e30094bc32 SHA-256: 0fb59a517b0fd56afac2f939f0e70a05156d7b5fd2e9c9b5d763922c2c69cb93
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hanabi-la.com/uploads/files/17723716049.pdf In PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210902_3F556CDC9AD03B32.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/87467000671.pdfIn PDF document text
    • https://ijpdua.com/contents/files/jetitituxosibijilajajix.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/71257188254.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/34711704786.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319f0a43adb---wububukas.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/xuboso.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/fibuzagawinepofenosaganiv.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/bepusenomolu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/jorisijugezare.pdfIn PDF document text
    • http://reylab.com/userfiles/file/damalovesobaduwezasopode.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/83778213364.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/xazotabaz.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/fujatakofujoxe.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/jifofiligebati.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/fijewodunujusuvoregoza.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9a2c109---mibenag.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/98486332499.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/toxegexopetara.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/87214661864.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/fukejutetokonavo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613699ce564e6---17898750465.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuwew.pdfIn PDF document text
    • http://philboyd.com/63413536923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=printable+inspirational+quotes+pdf+black+and+whitePDF 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_off0000b798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAA 14864 bytes
SHA-256: 60b7afa43fa47f3a0792777f83819922fc04491dde0a02aadf854c839a99979a
font_02_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 11284 bytes
SHA-256: 5d0279ab79e6882996dfeef31d43b6c765f6c4cdd0607c6d846b67e739725e5c

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