Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bbf403296f65d0…

MALICIOUS

PDF

83.0 KB Created: 2021-08-21 23:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f0ff7ad011cf52f608c08b17d6a4bab6 SHA-1: 7dad01b790144085020194bc35fb9b8e69aac126 SHA-256: 81bbf403296f65d0ba48cee5694bc8909d2cf402f992e0e44a6342e9dd17dd15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://on-call-anatomist.org/ckfinder/userfiles/files/fezutuviralugus.pdf In PDF document text
    • https://ihotel2b.com/upfiles/editor/files/xoxoti.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db7a34c18---9237575909.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/vekifenumigewabujowemi.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/pezanibinizunosikurowi.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/21426202119.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864c38426b6---98856405873.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866db62b3b8---27562934708.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/25cccbget8le9ebi8g2nl97kcs/33075494235.pdfIn PDF document text
    • https://buka.ru/sadm_files/50311033217.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/rikoviper.pdfIn PDF document text
    • http://naviway.su/upload/files/bilazefagufokix.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210611205146.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/44328696052.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/89f8fndpmin1gqp8a3udejor2a/lirilidupizajixovoburavef.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/49166901133.pdfIn PDF document text
    • http://bio86.fr/fichiers/tezepajisiva.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df80d8132d---widojosarivonarafiraw.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/towowuxux.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ee7c0970---7489042696.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/14768110066.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7aksqi6pa31765700jq1vrvluj/xakurutetovuge.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5i3cp1djflo5vr0omam0p20073/83478045780.pdfIn PDF document text
    • http://scro.ru/pic/file/lagoxunugoxiwiluk.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/sofubunakofubotifapus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=is+sandwich+pickle+healthyPDF 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_off0000df9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9B 18068 bytes
SHA-256: b9cae26ce9323ef6d596d10140ca9ee3aea3afcbb6cddb2441d9b34c57347a8a
font_01_sfnt_off00010cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFD 10632 bytes
SHA-256: c96472d77f55c48ba830fd074a94921aaf0e8e192f498ce6dff674101c43ebf1
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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