Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3ca25bd60eb927…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 22:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68509ceff3f46b7eb21d3b91a39da1c3 SHA-1: 66fac5256263d222e57f62d52378011bf5f979a6 SHA-256: 3c3ca25bd60eb92781e4b728a5eee1425a96070fb9f59664fdad20a4ff0c995d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading malicious files. Heuristics indicate the presence of external URIs and a link farm on disposable hosting, further supporting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://huntic.ru/uplcv?utm_term=pes+17+iso+file+download PDF link annotation
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdad12457a---komudanived.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/tapimafimulutesumopolanuj.pdfIn PDF document text
    • http://offerparts.com/upload/files/91317897490.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/37982880955.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/79181820285.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/dofetilamemivupox.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/88310716700.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/rajovuwokudagozanoga.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/42702978191.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/98649893763.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16135687c0fb69---mefobilafaliborubowunu.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/sifimaxu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2e036f88---wifiwabi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c74258a04---17154536380.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/39503171334.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/komuzolosarilesaxovaxal.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/redefemizudakoseluxoxukig.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/busimojisezozemetigutigar.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/worixifepo.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/12194976651.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/dibobodumuriguzi.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/filukas.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/vobelusuzakogopeded.pdfIn PDF document text
    • http://metapolar.hu/tmp/kifevofarulipozowamowojix.pdfIn PDF document text
    • http://linza-market.ru/upload/files/jiwem.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamupeluvumolaf.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161359eb01e4c9---dibuduzumogozapagagonuxa.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_off0000ee50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 17508 bytes
SHA-256: 0b231da98f16497f479b3dc3a4f5d19d31514675ce95206d27b32ff65d6a1671
font_02_sfnt_off00013413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13413 10336 bytes
SHA-256: 9abbce33b48c56596cb0f697e901100eba9e9575dcc8e53edef316fcc31fdde9

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