Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92d74c5dae7b1a2…

MALICIOUS

PDF

99.1 KB Created: 2021-08-06 17:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e33e66d807e698cb9d531c66e5e8f7cf SHA-1: 3cb64553e10f0686e96a99976a2699968913c645 SHA-256: f92d74c5dae7b1a2b6e5310294ca4738d29932b0c482bb8b371cd68606cfaf46
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URIs that form a link farm, pointing to various domains, some of which are hosted on compromised WordPress sites or use disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and embedded links suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=macbeth+comprehension+questions+and+answers+pdf PDF link annotation
    • http://phuquytravel.com/nguyenvanlinh/files/80183393683.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/15778777584.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/bonajuzad.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a14181a0722---2533319001.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b3f09b57ddcc7347f9adc7211dd0dd86/51324058153.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/vadanokikub.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f2df8a209891065a7061f9bc88992055/79878307701.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/71385506566.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/61128331454.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/turadamemosilobumi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072f2685db81---85515590332.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/riganexugigenak.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/20dd6623b3a0b0ef2fb4a5fa2e9d0d27/kibutinukowusunitut.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/sotetirejipoluzas.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/56251597746.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea352539cf---48351902988.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ae0a8743---wonenejimaterejeder.pdfPDF link annotation
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/powanowasivumafaroleje.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/a7c5bec974c62ee8dd559b33d6944710/majamenuximuvepuwilisa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tivexozatiketafag.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/26128298437.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/93583857335.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/72143621065.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28429425bd---wixabibobufiwedoje.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_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 11304 bytes
SHA-256: c9ae8f3448e8da313ad2a9d6a4a91c97fb46d77ab2615ccf701171b96900ae9b
font_01_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F52 17424 bytes
SHA-256: 2b0bc8295b12d7c33a29a8eb4beccc596d3657c345fd84f399a4ae9e58df5aee

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