Malicious PDF — malware analysis report

Static analysis result for SHA-256 befec6de296a564e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 01:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 879dc63a8c2b57c46d4bca55cbc57b00 SHA-1: 054426484a9b12fa48cf9084427613aa74bfcb1a SHA-256: befec6de296a564e3e7085dfa5e048bb979b446b476ef1b0bd7184b9d5e712fa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely involving the execution of JavaScript to facilitate further compromise or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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 https://crysiq.ru/uplcv?utm_term=pokemon+rom+nintendo+3ds PDF link annotation
    • http://borisovhlebprom.by/var/upload/file/xozinijirozavad.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/sebidirotit.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/rupoxejibaborogizone.pdfIn PDF document text
    • http://delifarm.com/images/file/5465300805.pdfIn PDF document text
    • http://jiab.net/userData/board/file/9947345818.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d47986dc9df225cab9ff32578aa1ebc9/zitugamipetinodesu.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210924190635345.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bipixatenimadozavedeb.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lalosifup.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139700039658---gazewaxorokubaxixegilap.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd1f43074---54040175210.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/23560275020.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/69426080030.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/77506041957.pdfIn PDF document text
    • http://dezis.ru/uploads/files/bijekamopokugusopi.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/vululixodojafe.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/wamapozuxonowijerew.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/pupuna.pdfIn PDF document text
    • http://jn-zhsc.com/upload/beratuzobux.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/91757885743.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/kozumudepowibilofa.pdfIn PDF document text
    • http://mp-journal.com/media/file/nigipopogotonopikedi.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/55895908368.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_off0000b020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB020 17184 bytes
SHA-256: 1c873a5e9aaf79df76e4a9252dfe9cc28a19bcca57f8c9f87afef5b172908f3a
font_01_sfnt_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10468 bytes
SHA-256: aeaf2335bac4a8b4e50d4e1d6bc125f3e6c74ff951ed6d45df14ee4bd3af91ed

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