Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf808f9f2789a19d…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 12:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81c50827cc4c30c560cc7c190d5537d1 SHA-1: d1faedca401eb15f1ebda9d6e385a88c14128aae SHA-256: cf808f9f2789a19dbb550de0adc2cfc329937ad530f4d53dd1448d3b3568efa4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely to host malicious content or phishing pages. The presence of numerous URLs, including those on compromised CMS uploads and disposable hosting, strongly suggests a malicious intent to redirect users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=xamarin+side+menu+android PDF link annotation
    • http://aimecostruzioni.it/userfiles/files/28852050955.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fudoxubisefafez.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210916185904_rfd61k.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/14714758265.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161443ab9d2d76---55290402471.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9e0fcd2746b374ae52f1204af7306ef1/21460592330.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341e8959ef7---xizexakowivinesu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161bcee3a9---95124534748.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/14203494177.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/6099087672.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/53128363746.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/39974843345.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/83684896099.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/6815511986.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/weguruge.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/noxawerudedavorimika.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/jexuzirubapulibot.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/45002826365.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/jevirupig.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/lidewetopikixuluwefovazal.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/fiviwuwizixilewileko.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/pagujaminibamatomanupi.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/mabukefunopomoriwo.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/jufodozovi.pdfIn PDF document text
    • http://teresachild.com/upload/files/bakuwagafexegivuwi.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_off0000b3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AF 10372 bytes
SHA-256: 7911517155d1e2cea10adbf740f6e43d86de6499ff0ee9c12b67e76fe8e71599
font_01_sfnt_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31A 14948 bytes
SHA-256: 113968e7f372751da89f52b80712c94544c864288baac6ac8c5a9fb44f66f47e

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