Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c72eb401b9db77…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 21:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e20f521b69051fc88eed4fd77bdba2ef SHA-1: 78befa135e70a0d5776b24b2f4b45345a6529e03 SHA-256: c9c72eb401b9db774de4f3001ec3c16b0a469ea9b5584161d8e1bece39f9ce3e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The presence of these link farms and the malicious classification strongly suggest an intent to deliver a malicious payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://odpadykj.cz/UserFiles/File/84191189801.pdf In PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/dobenalifokufo.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/44689762786.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/zinevuxojasonu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/65934106201.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/18336562074.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ftqg77337muhhlnv98nej9spn0/7247519271.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/16e9b2e366e30ba4b5d15be1102da6f1/mivogolakupofexule.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/gukazedati.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/c4khtcg8fbc3n23qsh67g7cu83/kamebi.pdfIn PDF document text
    • http://redactron.com/userfiles/file/80263422572.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/81075345241.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a1efb26ecf6c1675f66a82bb37f60578/towonujeki.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/40988885657.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96a0630263---15734221174.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-9/20210809235729105697.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/44847776828.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202108131328495901.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/90018301609.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/35833044527.pdfIn PDF document text
    • https://ka-base.no/images_students/files/rezujejokubalepamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vroom+theory+pdfPDF 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_off0000c238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 10272 bytes
SHA-256: abd7405e0790fec9159aa948031979e72ad119873a23350c38693a35c598b36b
font_02_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 16348 bytes
SHA-256: d53283670e829428d7132dbb74ef9ba410cb4ad0ef41a3bdcc15a80b5dbadb3b

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