Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bea1a6fbfd76e4d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 04:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 904e0c02ce1ff81f4d7a0abc8e145584 SHA-1: 4be0085feb0c02d224d2ff083d4e68c721cf2166 SHA-256: 1bea1a6fbfd76e4d2babb747d53d8f397498c43252dfbbd50791bd49b404e19a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and link farm heuristics confirms its role in directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=trigonometry+finding+angles+worksheet+pdf PDF link annotation
    • http://abaj.cz/UserFiles/File/towaf.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///fajomok.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/93895477251.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b273c5bf9f---97368904446.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b4429390---taxejefeximaj.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e74930414ace3b4b61a6dacdae0722c4/nakojagaripidepomewef.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/82439320182.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/pusomulomidaxatotexa.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075f23c8859d---37902866604.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/farofopuvipozuteg.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///77807296176.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/tajawibufanogiguf.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2e85a260---fimegifokurilogoxal.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/50202352541.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/35957644414.pdfIn PDF document text
    • https://remini.hu/userfiles/file/zajufifowuk.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dae105d0f2dbde027ea80662f99759a8/24793392719.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/pogetulatuteroled.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a75a8dd2---xijofikir.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e7752f5db---niledofamonozetamepab.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/58e9967fb49f659f69e468b80100a9a2/fidatuvazomuf.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160781d049dc06---sugixoruneno.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/62895955586.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_off0000c1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D7 11200 bytes
SHA-256: 95865af4cf0801245b837a6db304ee5d755019cb2c57fa9bf83004ccd7103d98
font_01_sfnt_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 17000 bytes
SHA-256: 164b6c1a8363a540599e185d30a958e204982fd168ed8d5ece8a986c297c853d

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