Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cd167d46747d89…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 17:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 52ffa7ae4924d8879612faadf5978ce3 SHA-1: 1d308af56f8ee862f89c1272b88261a6adfa9654 SHA-256: 15cd167d46747d8974dc2d2c5001da984dd5a31be762366900b674d36bcd829f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall heuristic profile indicate an attempt to lead users to malicious websites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ketchas.ru/uplcv?utm_term=eamcet+practice+papers+pdf PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50545a2d1---52132378699.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/75367866132.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/bowilejufeze.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297f21db74---50305324694.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/3f702cd13369936148fede304577d05e/wejukarapawofevibage.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/80m1fj8ug61nit13dljqt0rru7/58818789017.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/e61deo5jf3jbu0beq1d824efqb/jatedatupopekemizimedaza.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/velukogusodisejenal.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/28013084312.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58bb07700---49826953773.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb55035e67d---peboner.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/mt9s8hk33vsdg22qleu8ml79v0/lezopedudukilanirebugoga.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qj3u8lbhquh33m8vapj2pf6ivg/xabivifarolimavigomu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087dc11402---59542026097.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c768e65451---zujanubidalezo.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/91216422385.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/waredigorupabujupamawo.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b89b77648a7e0e5597fc531e37894667/litumisojeruselopakoneka.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18fa85df09---xagijejasijebili.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/luzafitigu.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/89275137136.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/780e823ab91576462be9432a85a8b32b/49082942168.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/n63b50gmdcnmoihe1bsit1j28k/55638039001.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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 10496 bytes
SHA-256: f15ba65c0cb4cc4e6d9ad7e351b37afc7a6abac7dbfad9e656a30eb1d7582236
font_01_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 17196 bytes
SHA-256: e9b12363293118b59d02fa7a9adaa5eeae0416e037b81c7702d2d124ec7941fd
font_02_sfnt_off00013b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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