Malicious PDF — malware analysis report

Static analysis result for SHA-256 762add52ebb4a3db…

MALICIOUS

PDF

87.4 KB Created: 2021-08-02 07:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56dba3cac112db8015b615e2b0954aa4 SHA-1: c2b025f576634921fff58cbe99ea16d5ef5e31dc SHA-256: 762add52ebb4a3db31993a8af9c6724a10c1a66b27e5d62f2abffa6032bb6934
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farms points towards a campaign distributing malicious payloads or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=how+to+submit+the+passport+application+form+online PDF link annotation
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160926e1493a74---juxivo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/g91ntq5oha3hdoftj3smck82nq/40669298080.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/wavoder.pdfIn PDF document text
    • https://coluer.ir/documents/file/laferonorumised.pdfIn PDF document text
    • https://efnnma.org/files/file/86758189117.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a9a242374843dd97f56a508a3fd60574/78362620531.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bccec7b7612---sibibupenoxot.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6f6ae7fc344ba49dfb4631ae083a20f6/vekisomisesuz.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/75744615314.pdfIn PDF document text
    • http://wdnederland.nl/file/kefawegajegedorinanevez.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/43339241264.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/psn0ooj2q4qh77hjilr3qf6mfg/sifanavulig.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c3ce769a---burajexum.pdfIn PDF document text
    • https://melz-feu.ru/upload/botoxoduvovi.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75459bb56c---94048269050.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/gatiwis.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a776d1cba---fazidujaka.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/pazusikikedubi.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25fe72a7c7---xovokuzek.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0821ef2b23---79669047014.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/dipusikaxudotigivapagad.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/zotejiwekoxerosaz.pdfIn PDF document text
    • http://mfdesign.hu/files/file/lolurigegawozisowira.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/987f67210b5a622da902cce2b9d58ea9/jigamupaxowotujisewepesaj.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_off0000f28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28D 16796 bytes
SHA-256: c605171eaed84d743b2e794ea36fb427cf2bca6cadf33c716a028e356906e9cb
font_01_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 11064 bytes
SHA-256: 04b842ffe151267a883b2ad0a8a89b1ab1c9e64efcb8989541d643ac0a12c709

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