Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f99a8898f2ec89…

MALICIOUS

PDF

73.7 KB Created: 2021-09-24 20:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 153192da2cfb5439d38e37f47cfc8331 SHA-1: de0c0bafa5739410e045a09d43a3ac6c17190110 SHA-256: 07f99a8898f2ec892531d6e87e1b02d4c0c3bd93d7c9f76a94d690d9e302a85e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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=win+7+ultimate+x64+iso PDF link annotation
    • http://innova-perila.ru/upload/files/61147040465.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/resepowipijagunirasesu.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/xukinofirowaboxe.pdfIn PDF document text
    • http://vhktn.at/images/content/files/notigexij.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/kotavojajew.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/0b0b75d3bb9850eec7ad02de1fc6c5bb/kagelalumopez.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/fisajatiwefuparoborasabep.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/97471170628.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/90167224880.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/92541257122.pdfIn PDF document text
    • http://mextro.de/upload/files/31645272700.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/92191351827.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/48992673393.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389f727f707---dabujoronidije.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/89694088972.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/56233585456.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147785549ff5---53232897553.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/sidewufazowekukesurabo.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210923_92030D9A9D312580.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/78938878238.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/26488960013.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/9355712145.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/xekoxep.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/79076089597.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/37383428653.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131905a39e32---99214078276.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2478faa06ad81a6101d709e3dae572ed/semanesuw.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_off0000b907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 10660 bytes
SHA-256: f8d5af9ccc22587543f92b5ee359962a9c0e8228247ed2fe4dde820aa343d996
font_01_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 18068 bytes
SHA-256: 96b5f54136215b85aa9c2b5d81b443d87b9e5a3211b95538df26899e3ba500d0

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