Malicious PDF — malware analysis report

Static analysis result for SHA-256 8292f29dc8442d5d…

MALICIOUS

PDF

68.7 KB Created: 2021-06-09 05:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: abbc16f8508a9e3e653f008a703d1eb5 SHA-1: 487805b4f8025fbfb07c116e9847ab60f3336bf4 SHA-256: 8292f29dc8442d5dd1d86d5772949e9909b1ab507a895322b6d5330ffe760ea0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, likely due to its function as a phishing lure. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting an attempt to distribute further malicious content. The document body, though heavily obfuscated, contains a search term related to downloading a PDF, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=apa+style+manual+6th+edition+pdf+download PDF link annotation
    • https://riolospettacoli.it/filesUploads/file/zolumejunu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e5fe1d09cc0075f037e7c4206bc5e687/63352973319.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0272acde25---14554088422.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/52807539275.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/wetisematoxetowemif.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69e08c423---26121172062.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf10306365---zazodedisodef.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f72941b3f---42130139669.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebfc0fed2---vedixojojikolaruxazetefup.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fdc8431f5---86448545451.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/72953286572.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25be73262---watopatezomoranisew.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/88033132304.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16cbc5b2a---ratedituruxesumexeduv.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836875c91e5---dufajava.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/bioeu1tl3oklkci0tc8e9biok7/vadavaj.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5987a6bf---74135952869.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/57661210784.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF72 5520 bytes
SHA-256: 991fc36dacf53860d3e835cc0e700332273063f6656f6cd080a81b7912f9a9b8
font_01_sfnt_off0000e230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE230 10868 bytes
SHA-256: ffdfe3cd976dc734cf4406663fe088c9078fddde11d5a905b488d587a008997d