Malicious PDF — malware analysis report

Static analysis result for SHA-256 af98d510944f48fb…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 13:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fab7ea29ddab4388b0e67d5614050f0c SHA-1: 9e0e6e8b9c04b6ce2bf22290d22a50a65c07430e SHA-256: af98d510944f48fb726c5372e927ebe9cd4a266eaee022ffd9ded3ad9a40f572
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The presence of ClamAV detection and ML flagging further supports its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://noventa.cz/media/files/file/sumidujoribogaka.pdf In PDF document text
    • http://kurumakaitori-one.com/js/upload/files/mokijonexuzusutobix.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca332e269b8---54156149456.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/romefozizowiwunesib.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/98125208922.pdfIn PDF document text
    • http://www.bash.cl/media/file/leberuropewonosapiwi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612941d8be71b---dizumogulale.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db59572d2---tuzok.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/97953069159.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05827a75c---93542353684.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/zejorumojisubanukapirux.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/savemonadolezuvoto.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3c9da061---79242483214.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/76789640179.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/somugurokawomirolamixi.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/65391411413.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/419288545.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/wegagukikiz.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/zujoluduzoretetodirove.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c79c29d2688---22623609326.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210723142031416.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/gipejobifexatulepusegoz.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/deluzi.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/xojawodabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+compliment+for+best+friendPDF 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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 19064 bytes
SHA-256: 3a91e6b6b15663541ea3768d0d16dfeb97e214596ba06b8dce90c06711d30c2c
font_01_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 10812 bytes
SHA-256: 3f2040fdd5ae1ca1152f26b710fd598470fa1d6f838cafe7afcfd8e5ca34625c

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