Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ddb5fec01da6a8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 01:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 24ead94393a00756982abd5d1cbcdfab SHA-1: c2705c01962ceca1ce9938ebe113acdca3b4113f SHA-256: 73ddb5fec01da6a82524bf552406bd82b6c6991635b635c88e563430cf307dbb
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, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The primary lure appears to be a fake 'download PDF reader' prompt, likely leading to malware download. No scripts were extracted, but the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=download+pdf+reader+apk+pure PDF link annotation
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/1e42e3a0c79402187deba6c27f7d55f9/jesuj.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/47406283255.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/turutirumubodu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160741ab85198f---27600767415.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f7e4d706c---pijikipuzofetekuxozor.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1629000982/files/87234032565.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/55790477131.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/128505fc2c7567beade2f95bdd76bcef/36680678036.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160942b5ce2e99---nolibuvizisekamowuxepak.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/53760410447.pdfIn PDF document text
    • http://aven.su/userfiles/file/97592088685.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/12240349118.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/49213468466.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/fesemasegipixejuwaxi.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/76883442332.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/seruxedoxotojarafi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/2c203cc8f1d9a4cb2ce75f2c85cad24d/doxuzazudam.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91c84a64e---jajowagokowiti.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/kamuwuxiwirakototujumizoj.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/vudobaretexegawafuxakixix.pdfIn PDF document text
    • http://nensi.si/upload/file/rozexikedizojulemex.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kumowuxezorafov.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/lusoxid.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_off0000d907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 18012 bytes
SHA-256: 2643c880ac72325a76fd7ce2c8f07a2b4a155ff9dc741e649be757cf305cc2dc
font_02_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 10412 bytes
SHA-256: 6bcf9d57a234ec26f513ccbf984c0833fcb6e05e9753230df55f759828da5947