Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fb21f1ecdafe98…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 16:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81139fd09aaed2283b24a7c1911daafe SHA-1: 4ccc8081982ea0d52d404a0317fc9d72c7992d96 SHA-256: 23fb21f1ecdafe981dbaa436ef1c734a1ba82ea50ec496ec75586dde81ca41c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=tipos+de+sociedades+empresariais+pdf PDF link annotation
    • https://bravo-hk.com/userfiles/file/26007892888.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/dugutuga.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/73692889108.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/92902973433.pdfIn PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/suzowa.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731a876907b---61205642612.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/83790373883.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5f13e7a1---49600341083.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/38172626932.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/aab4751749bb62757bcffff01d8ea201/73988560711.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/jameximagefa.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/wemelejatizudel.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/vosekesevuwelesevu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbc8c64f1---69507236549.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/96025323708.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/jaligixotujagopofupinen.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/xelalizonosajexufix.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c66b18f3ee2---1207767024.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/37281978629.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/51006848094.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8069ad0d19---wiziririzefokifokovixake.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608665f291273---veleximokipavut.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 18156 bytes
SHA-256: 6d6c9adfa96f2cb7aa806680644b46b08a57c010364b47323a41e8f4a42e861d
font_02_sfnt_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 10496 bytes
SHA-256: 4ceb51dced91248b698365b8b7f400377df75e858dc6db9deb176e9b2f4afedd

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