Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a0c5818f7b9742…

MALICIOUS

PDF

101.9 KB Created: 2021-09-02 21:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1da867f7d6d062aa9ff8dec55ba622f8 SHA-1: e146670b7351d21ba91b109d456cbc7021ff046a SHA-256: 10a0c5818f7b974278e1af42b171d9ceec9f7208232d622841c63346fa59cb5c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://oniceh.ru/uplcv?utm_term=antiemeticos+veterinaria+pdf PDF link annotation
    • https://allcreaturesinc.com/files/files/dujomirajugerafil.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/2367600997.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/19884bd48ca97ecd24a443406c8d3596/zopaluzukuviposujipep.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/53620036743.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6813d98cac---11438017224.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/vikibagoluregax.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/laxabepa.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/84f46306859cb5c47c12bb2d70c012cc/11115357357.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/dibawepom.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e5bcb3fbb---97193064947.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610534b0a71f9---6005842235.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2c912ac2---nutos.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/pagitasinizusemitexasa.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/dujaxojidijizo.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/41961875252.pdfIn PDF document text
    • https://hagepoorter.be/files/files/71324683196.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4edb60699d9f63da161bafd03a13b4ca/78624195354.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac80a1d65---tujakutipa.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/defufoziboj.pdfIn PDF document text
    • http://cochu.net/resimler/files/88748048380.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd0d48cdf---83769167280.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93ae422082---dulalawaxogopulebutak.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b114f17219---85773136447.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_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBC 10780 bytes
SHA-256: 9d47aaf80b037cc0ed69abe534928bc7b06ea422e73378035838d527551fac4b
font_02_sfnt_off0001559f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1559F 20156 bytes
SHA-256: e546858ea49ff052a0b70509c0eb7869e646f8e62dd7d654694ab5d42321c7bc