Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bb4ce93182af52…

MALICIOUS

PDF

94.6 KB Created: 2021-09-24 03:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0992f067bbd26644450911b031203d32 SHA-1: 70b53babe891b5e93b6e224230f36744c634b3b6 SHA-256: b3bb4ce93182af5258696b021116a1982726cc1c961609f0c37688d01a342732
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a link farm designed to attract traffic, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9528

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cukorbetegshop.hu/files/pofinemekakedadipufegagot.pdf In PDF document text
    • http://jhdljz.com/userfiles/file/1631020147.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0fe6553b---lisetowifixox.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1217a6d6f0341780b428b334c1f9e03f/zamonifudise.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/81281100542.pdfIn PDF document text
    • https://jensbrode.de/files/file/ribifitatosalaxogu.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/96967797223.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/vakulof.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/49504513047.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/zajudomusugosoma.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/nufebavomerom.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/texiwamoj.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130741f81365---56590483787.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/68526552017.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/tewukapugesofumudipus.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/dasodevodabunime.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/puneweb.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/fafafejosofeg.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/rokijutovoxutomatewubu.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/wazoneketomuwitazitosala.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614169316305a---porimafoguju.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/volorajexiwuvotazeb.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/90123233449.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/gaxuwosudox.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/fasogulasikavarenolemopad.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaa938821e---11225968228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+game+clash+of+clans+mod+apk+offlinePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 11048 bytes
SHA-256: 88e7b851e814c0fc2aeaddba923566cd12cbc57e01f95e96eda9408263a24168
font_02_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 16712 bytes
SHA-256: 5aab50272f1c40dce8b92f9cedeb2094a5c2c18bd70d450d5ab333c7f9bcf1c2
font_04_sfnt_off00012a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7D 25216 bytes
SHA-256: 5c0fb3286638b312df6fefc05f50caeacdf6df97280d535ab57f883f5953ced5

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