Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac0b57483c6de76…

MALICIOUS

PDF

130.5 KB Created: 2021-07-25 22:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28a87e91c11607b502d07160bfedd3d5 SHA-1: 7196b0c2dcb8596eae82ec495272ea95be822e2f SHA-256: bac0b57483c6de76a3786cfa1dde8eb69d5a9edc7319e6024496defd31495f7a
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The presence of a password-protected archive lure, combined with visual download buttons and link farms pointing to potentially compromised WordPress sites, strongly suggests a phishing or malware distribution scheme. While no scripts were directly extracted, the document's structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f6e4a2510---9741365901.pdf
    • http://bong-dem-long.org/upload/editor/files/vagejewajituf.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/0c6ef92be47627c087e274be25964816/lenati.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1dcjkv747kucenfql6phj8m9he/xebeti.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6d485a69f2b6cfff8d736e2a11e8f1cd/wukolifopemejolo.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e15d6fb0---rurisomesexosotovojewafa.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/894855965a8ea442ac5c3a543d61a84e/xumopitanofujokalukifa.pdf
    • http://ngor2-3.com/file_media/file_image/file/43651142902.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/48fa6e965eff49e0b15f94e36a082aaa/60783020367.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0ad0d1af8---32255456916.pdf
    • http://karpatskiles.ru/store/file/90052341677.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9lc3kkkg56oh5ubq70hkfg872v/84860627645.pdf
    • https://rajaunited.com/contents//files/kabaginuxageret.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jrd9sh4jqbt9f5qf0rnl6c1vhd/57811523176.pdf
    • https://frontivo.ro/userfiles/file/zomexenatobibaratelirap.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da736b237c3---dupuzabagateluko.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607afbb89c29d---wabagutosanitulafu.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaecce29e92---19397691952.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/3ej9ljd9sviq6osnvru9rkes47/tujasagadidizibi.pdf
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/tibowizinejajalugibid.pdf
    • http://perles-del-beya.com/userfiles/file/17555342416.pdf
    • http://au-coeur-du-temps.com/userfiles/file/23438338825.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16082a894918c4---29671554671.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=clash+of+clans+bot+apk+free+download+uptodown
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A11 16792 bytes
font_01_sfnt_off00019223.bin
9c922a7add72961c43de199aa6376d48490be8c0e846a47f6167f8a43cd06982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19223 21848 bytes
font_02_sfnt_off0001c9f1.bin
9f263b99570714c40c8b336f0b02102a1479a803a88a9a17c059fd575409fe1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9F1 11076 bytes
font_03_sfnt_off0001e39e.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E39E 16092 bytes

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