Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe778a492f4cda6…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 21:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa08eadee629c00dcf6852de2bb7f76a SHA-1: 37edad08b942a5ef53d993553665a453bd3cdc30 SHA-256: 8fe778a492f4cda6c66be4a3ea4ad1c019329e781b3d57de8216691c82a0cded
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, indicating an attempt to execute malicious code upon opening. The file also functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites. These links likely lead to phishing pages or further malware downloads, consistent with a malicious phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://garglob.ru/uplcv?utm_term=the+man+who+couldn+t+stop+pdf
    • http://w-f-l.de/user_img/file/70289477291.pdf
    • http://michellenevinracing.com/FCKeditor/file/30241215961.pdf
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/91801150686.pdf
    • http://indyztyle.com/ckfinder/userfiles/files/sabejulawikalora.pdf
    • http://cpgny.com/userfiles/files/nakewewoxinila.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/e9n5qlqutbsl9vibuk11tce64q/wijapupaw.pdf
    • https://smgbid.com/ckfinder_userfiles/files/84598985949.pdf
    • http://formel1vermietung.de/userfiles/file/52700737924.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/fewarafuwimidozufufex.pdf
    • https://wintechindia.in/ckfinder/userfiles/files/44204710812.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614726295513a---rakipemudori.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109230015518856.pdf
    • http://podolsk-kondicionery.ru/upload_picture/file/fafijujete.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/486b3a783ee5fc542c5d919dae014fa3/kavirigireki.pdf
    • http://vrieshorst.nl/images/uploads/file/94320886224.pdf
    • http://carnow.jp/js/upload/files/14505315873.pdf
    • http://soluzionebenessere.eu/userfiles/files/zifasurapawigobiwedi.pdf
    • http://dakmet.pl/upload/mejipukagujinu.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fdd425de289686f5e5533e5f78f97590/ladezusogepexi.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/zilobibuda.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/82511302149.pdf
    • http://dentalclinicbangalore.com/uploads/50018557599.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/87523176421.pdf
    • http://lg-palette.com/upload/files/datunurowel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 16792 bytes
font_01_sfnt_off0000ccf7.bin
48295f83f47f835437746a3de9417f4edba7ede26694b50b363f0390ec9191df
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 17784 bytes
font_02_sfnt_off0000fb0a.bin
fc3985b1077d089e6e263a920d88e6b4184d709e3f44de76984b9a5e2568318d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0A 10844 bytes