Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3016b50b93cd085…

MALICIOUS

PDF

69.0 KB Created: 2021-09-28 12:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 170d3cf632331e4c3c87ea4b5e756d7f SHA-1: fe065ec9f6e299fbd8a86f65f05bd1218afac11b SHA-256: a3016b50b93cd0851a725c3ceeb955ba8a8117bff8beb8abb75979b5578a6794
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document designed to trick users into clicking an action trigger. Numerous URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing campaign aiming to deliver a payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 69 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 http://bumsnab.ru/uploads/files/93003501092.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146aabf2d2a2---29059741620.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/88188768481.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/27436284786.pdfIn PDF document text
    • https://wrd13.com/force/file/xumizovapa.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/fobupifa.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/98805921693.pdfIn PDF document text
    • https://tarsiman.ee/files/file/16720550635.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/88953006813.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8366cc4e3---zimupuwisunomufolo.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152551e3df32---jakeraxofaja.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/wurujedex.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/20494188190.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/37801929575.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/37207065521.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/21049302545.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/24944646851.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/17909745926.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/tipemegamosenatagal.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/kaviboxirezotobixovezi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2tkgp07tad0ne2fil4olpffmd3/37760797988.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/63421511467.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/38329405444.pdfIn PDF document text
    • https://lesura.net/userfiles/file/wivonolajedux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=convert+excel+file+to+pdf+online+freePDF 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_off0000b334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB334 10484 bytes
SHA-256: afb98029e0ad86c0d044da48b81633817f798b7c14f0c8f4a4bd83c82954b750
font_01_sfnt_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 14024 bytes
SHA-256: eeb14e4429a77658e919597cb60fdcc55e89a596b9cd5a69a1e4332f1e916fc7
font_02_sfnt_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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