Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fd195bbd17ec97…

MALICIOUS

PDF

86.1 KB Created: 2021-06-26 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 73e0247e396f495bd7aba09c3bb051bf SHA-1: 3f2986d4e493b3cdd7ba34433a340339b0cbb36b SHA-256: 25fd195bbd17ec97dfb3ed3546bab911f3b15ad9b7d10eafd295aea2646c45e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=periodic+table+chart+hd PDF link annotation
    • http://thedreams.cz/files/7897479100.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/33408685745.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079a12f9dfed---83734667797.pdfIn PDF document text
    • http://short-story.ru/upload/file/zutewodopekuzilidipid.pdfIn PDF document text
    • http://fxmeat.com/upload/file/753afd072764e43492fee2b8b7f06e51.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/61874748847.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2cc2d95b5---17519960107.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/9qhjbc75qddgbh7c8i9oek8laj/94126147215.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087384389a7a---66878013398.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8ae99ea0---fawadumutikoluxibenave.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/095b8abf54b28ac302e0bfa2acbd71bc/lovonegidu.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/93018949770.pdfIn PDF document text
    • http://stromzeleny.cz/file/lefizudoxixamile.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38406162f4---deradazejopava.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/gonesiduzuzogagoruge.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/q1p49rl0309rirehfgf7q3k0s7/75768788784.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c511120f0---4336612706.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082d8ed0db7f---baselibiberuz.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bca6b5b4a20---25260038855.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/3b21a9249694318d7d891cd8cf7fcd6d/kodugogesim.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609214d11c68f---33329484426.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jalakijofi.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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 10336 bytes
SHA-256: 53b6dba2f8a2de4acabac1ef87bc4fd79d91229da2a781635032ac944be3066c
font_01_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 16704 bytes
SHA-256: 4af96f4269e703e42574d41a4206f072ebbb0799aa8e2d3bb4d2d5cfd74f0d20
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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