Malicious PDF — malware analysis report

Static analysis result for SHA-256 1caed665fb4d4e67…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 10:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: af0e8c63b73a1e7c3d0d983309da3410 SHA-1: 7621a3a15ecae414d7f4b556d46092e3ab7b0268 SHA-256: 1caed665fb4d4e67197aca2c7aa221b5f81c934a0f3f5819a08d57652b0862b2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains, likely serving as a distribution point for further malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://cructi.ru/uplcv?utm_term=enttec+dmx+playback+mk2+manual PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0a7e9c841---35799755902.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/89842596921.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/u2pkt29o3qtl4k0jdtrpunukan/79659995308.pdfIn PDF document text
    • https://loctra.net/userfiles/file/gepimadurobazatukajilu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7mtom284j25sq4vhe4dcmuqaaf/20707890491.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/86000532120.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/6611fb8a246d618df9c5b8a21050909e/gepelagofad.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/sevijowogufofo.pdfIn PDF document text
    • http://yuha.be/_files/file/47789757971.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/u09csmc6176rfe1le7imrk2s54/losozituba.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/82184688661.pdfIn PDF document text
    • https://amblamy.ee/upload/file/61763921413.pdfIn PDF document text
    • http://wernitznigg.at/files/64850267369.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a73aca741---lavit.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/33210925183.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f45bd58c8---73863607083.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64625421856.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/pozoxasin.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/41334135861.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/60123498828.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d452d8f9e0---votan.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/xinedamafu.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19428993082.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/vuzubamikisegise.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ebe26e0cd648444080ab947f2556f3f9/kibixomanirilor.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 16996 bytes
SHA-256: 6751e5ca38ab2e3370207082bd08031af112dc1124ce25628fe013c1c55a73d4
font_01_sfnt_off0000f59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 10848 bytes
SHA-256: 93cf59569d140487182d5efca0c938df8e220a7b1436b6ec6e715b9ca0abbce5
font_02_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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