Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97675f8b83dd6f9…

MALICIOUS

PDF

82.6 KB Created: 2021-07-01 12:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 16c9daade63ca40744c9883f7cf93680 SHA-1: 053b5b9237ddd20f544dd9a39fff121e7ee5dae6 SHA-256: f97675f8b83dd6f96a3ce5023b6d4bc06d32b7f0b5f6968ea902e34bba0e7229
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links to external sites, some hosted on compromised WordPress installations, and employs lures to encourage user interaction, such as instructing the user to enable macros or editing, and providing password instructions for an archive. These elements suggest the document is designed to trick the user into downloading and executing a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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=how+to+make+pdf+uneditable PDF link annotation
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/38m1jt08cnhradkk74fi6cpdj3/doxupi.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/48498614203.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/zipolujodakitago.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/52847057493.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/6982455564.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/bc2693cc0d4e541521997887e492370b/92289201174.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e7e877c47bc72c0908c01efbe74e4275/97657847676.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/33088678741.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da49c9ccf---ximuvemosumotuxuzoto.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4ae93fa61b2fe9bdd44aa7a82406d20b/pefiposulotowilesog.pdfIn PDF document text
    • https://morabia.fi/images/file/4837763687.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/nigafovefasu.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/tuvijejajoreputuvoj.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/sakedavagusifuru.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/96559026809.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/84537007076.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/86926976110.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a83dc61a54b1a92fff5027010bf404b3/kizetetop.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gazibixagopedoxalavaruz.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077184d3b33c---kokikunadaxogubulu.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/66021405665.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf65e29ad7---13352468561.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/rubif.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/p1j4qvkebkk48nfogd6p1ouqfb/82036509802.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a10770907d2---60069349300.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/44034233659.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5b22db9af---41726726403.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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 10800 bytes
SHA-256: a0443d4a82332985b09315e7688f1521511125cf3d2faaee4e03c902918dc94e
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E72 17736 bytes
SHA-256: d9cee8002fc0ddcb9d92fbf87ccc79ecf8bf666bd2d804d0f1e7f45035fd6c1f

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