Malicious PDF — malware analysis report

Static analysis result for SHA-256 851b250991df063d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 01:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f42edd3f1f1fa231edc62a8e3ebb609 SHA-1: 4083d8dc92c0ae000bf35b24fe38faef695b74f5 SHA-256: 851b250991df063d41584f3c62931df5f690baa1d01ab367b1964a22b10d8c46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The file functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=que+es+un+histograma+en+estadistica+pdf PDF link annotation
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1ccc0319---fenib.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/227485245.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/96308464053.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/74c5e62bf330d15a1a1f85a8e7c5b28c/11467671943.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/90901612557.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/42655030875.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/64300069707.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6199c52318---zaparerogonuderuvupex.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c25781c4412---virivatuseperetuvax.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/1d0f193eb25c978d0693e70e06cf0528/veguluw.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a88930fc---76730586260.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160bba73f31733---85084527195.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160856c5b662c1---9542777473.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/53239353599.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/2237450324.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a1ade9280---41281493814.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/389081130.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077631f4c037---benetotobarogomulaviwavu.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/subegerawi.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/bibodarapazopimuxedoxoj.pdfIn PDF document text
    • http://alvirne88.com/clients/71477/File/kexipirosiresewaj.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/bokogitumivubirodixage.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/360fa4efea915689ba40e814562fa30e/76831172140.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/mexapokepuwewokinetexepav.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD926 19076 bytes
SHA-256: 89683887ae5c9ac89386e653e541c68d92a5a6fe2914b33c0f7683149deb2dce
font_01_sfnt_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 11180 bytes
SHA-256: 877c3e228cdfa83014de18d52adaf9f8a4d0f7b91bf053772a0ad1a6c892f454
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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