Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f3003e8f34e1e6…

MALICIOUS

PDF

96.1 KB Created: 2021-07-04 10:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c09b95fd043bed12fa139516b04975e1 SHA-1: 29ee74a157c8db79f1cccd7a302ebc0b3df98090 SHA-256: c2f3003e8f34e1e6841b8f527c5e41e1c64858e8ddc8753f8b64a597ff6f1666
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm, directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/jazotisaxedis.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fddb1d65ad---28492693196.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/fetedixifodag.pdfIn PDF document text
    • https://airshow-bg.com/file/23887327803.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c16be29e0f6---82318994653.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/naxel.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a692a38f017c1f65bc5d0ec88d666639/kibumepejuzupaseki.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/rafigi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085c27829773---nijubawola.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160704dd37846c---nesugabobebizew.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/topose.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fac7a6bd---lelukavewekekazifol.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/redeloforibujararedor.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/59223103759.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/763440652.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/sifodadutenokepef.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/jizoxikiv.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a584d4ea9b2---rukupabuworevusilol.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/16951183131.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16085371ebe6fa---nelekikuliboxa.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/7395162288.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/85318812645.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jefomisureve.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/d4jhrvo94q673l7g2pjbd5htmq/xajidubaravu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=rate+time+distance+equationPDF link annotation
    • 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_off000113ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 10676 bytes
SHA-256: 8a07ab8959c29df239d9feabfa2ad9606362c0a58fbd76c2f7da5bc78055b656
font_01_sfnt_off00012c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C01 17528 bytes
SHA-256: acc2a227ecb12789b9cda73969c951a7a1e2fc6680359b8ea20a86cf8e48be28
font_02_sfnt_off00015994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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