Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c17996ff51d3dab…

MALICIOUS

PDF

86.7 KB Created: 2021-08-26 05:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 17d2e6a819ddae4af90b420f7c90882e SHA-1: 3a9916f442dd3ba2003ce364f98648f7ff9575a6 SHA-256: 1c17996ff51d3dabf31dd4a3bdaedaef5553e0c38d1388b4d7463e699c9aa229
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware delivery. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=top+5+best+android+emulators+for+pc PDF link annotation
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/bd7a087037cbeae1c96b8e3740c3fc8e/37744399337.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/barojejix.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/53236334187.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/a54c5a4bc25fa9deff5311bd527da02d/8321265101.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/lebapiwiri.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0b30d18ca8a7debca5532c7df7ac8031/mexodijubibowoge.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/birezamu.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/54238756019.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0c34a62d6f29c3f272d810008d00b75f/keradebuvisoxu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2ba07530e---35846217037.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9tbuorm145k2bkgb8m843hn14/50807434242.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf94d05165---kezulelireji.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/37432853598.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/mazalemufaw.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/556780456.pdfIn PDF document text
    • http://aimic.com/userfiles/file/mamolebabariraz.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/jolobivalimo.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bf28af7d6---pigofa.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/pefinagoromotawazetefo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7968ca442---56143620265.pdfIn PDF document text
    • http://risme.vn/files/gufejisawab.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lq38kgv2de6dpr8knsvl77kt96/56556141180.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/20087552547.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_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 16956 bytes
SHA-256: 13f211adc5dd84ce0ccf6e93e1dc4df4188dd8b99bdd2c3d4bd54e9b8fd64cec
font_02_sfnt_off0001336a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336A 11120 bytes
SHA-256: 3fa4f03aa411d1d5cb76c9e34c4683299a3b83941e338cd72aaf160e08857c75

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