Malicious PDF — malware analysis report

Static analysis result for SHA-256 2789de138c771789…

MALICIOUS

PDF

74.2 KB Created: 2021-06-27 22:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a664c780cfeda625cdce5f0380273fef SHA-1: 83c40c3417fd1ee1850b955b14acfba1f2938cdf SHA-256: 2789de138c771789c06becccc5950455f91c27b443be886e73a77ab1563b7b31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan distribution attempt. The document contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=free+new+movies+online
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9bec89a3a---79433477604.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3c0afab8ca2ae407686d40cd6529744f/2248285684.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b825fe6---kakuzikuzuwoxupemafumu.pdf
    • https://balajitutorial.com/admin/userfiles/file/tibujuzanem.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4a76df7e86bd4fb1aba08a7f06ff5f22/lavefegosefifaxekil.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0129379056---24708142513.pdf
    • http://funperm.ru/content/file/jevedivok.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/25911618160.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/mb923n6lqe759r3o9kvo1uvlnb/kejanozadazinekidavu.pdf
    • http://matstravel.ru/userfiles/file/niwatoligupasisiritipow.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609a88b10c12d---gezisa.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/46b02440220845c76569b17278b9cde3/5282982306.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/0205vaefsn0nlgvebiak8bjev0/36223589831.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d2b7febbadc33b3dc21301ec04014069/bonudubavituzamuxeda.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893cf392310---norusiruxodelajodopixedab.pdf
    • https://al-farh-iq.com/upload/userfiles/file/bokiku.pdf
    • http://curry-box-deluxe.de/userfiles/file/34045918950.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/0d0d3a939bb21a6625e0a9913023803a/mimuxaxaruwigifojum.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95af609cc---73100064177.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784ae0b990d---nebogezi.pdf
    • https://cambodiaangkorhomestay.com/userfiles/file/xekilenowerevuwakij.pdf
    • http://bulk-supplies.com/userfiles/file/maledolorado.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_off0000c34a.bin
46310efb8bb99fe9211b8f526f01fe8b0da78c6f703c89eeca2db19101876735
pdf-font-stream PDF embedded font (sfnt) at offset 0xC34A 16256 bytes
font_01_sfnt_off0000ed2f.bin
cc6022cca1d74ed0ba4566d75cd85cbbca650e15afabbfbb5429356f2ef103ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10136 bytes
font_02_sfnt_off000103d0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103D0 16792 bytes