Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe774814600cfa7…

MALICIOUS

PDF

86.6 KB Created: 2021-07-15 23:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0c9d8c7007cfd8e972f01a2bfe5f9fed SHA-1: a50a7fbd5ffe22905f5192195e9adff31d512f3d SHA-256: 2fe774814600cfa7759a4707106d5b6804e73eb32d2064790b1b70bdc07802b7
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links point towards a tactic of overwhelming the user with choices, potentially to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=mechanical+and+chemical+breakdown+of+food PDF link annotation
    • http://kiuruvedenlukio.fi/tiedostot/file/fepug.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/2464220225.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160859dc6a0598---gepesofawete.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/tefizosimabajinif.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f1fadb082a7708f6d10297994ca1ddfb/9355728210.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/kavizexewurobakogavelam.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0f6ef2cc60dfc4891907876a2423134e/goketifo.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160921629a075e---60010621408.pdfIn PDF document text
    • https://mmszke.hu/files/file/45052072541.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/30885736790.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97bd5ea79b---99790045446.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/66151324599.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/nasowevun.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/tezilakuvafemaxidijox.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/dowogenexojaxanezode.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1fbf45bbf---87981576886.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6917edff---20552792781.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/glk1ua37eqbh633jl1ncrqbvje/valilokus.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/watibaxuriwefomizumazutud.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c473eec7705---xufefokitedelavizitujunoz.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/sasapozarewapopixivifob.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/m90hsgaabti29db550unmef7m4/luwazaminesakozaju.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1c62d4929289567e6ff7d2aa2a5c5e75/latabileliwivaxumoz.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/90008769649.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_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 16308 bytes
SHA-256: cc5036b75095800f07fc1626ca521c46dfdd3f472028f0146bd097a717103a21
font_01_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 10788 bytes
SHA-256: 8a7e9b0407f70c21b018c476c3bbf14b13820125aee95746a6374be41494b290

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