Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cde86d1d82a1cb5…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 16:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 757a1c3871c64c9e1e7c32e705937c15 SHA-1: 357597199777d2d80000de989aa63de563c00b80 SHA-256: 8cde86d1d82a1cb5f303923ddcc638893001b3184a1233f64e5ed688cfe35d5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://poornasreehomeoclinic.com/ckfinder/userfiles/files/15534756161.pdf In PDF document text
    • http://toyteepee.com/uploadfiles/file/21091207051218984584rtof.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210908053210.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/xefegupofilupe.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c97c4ea29689da45381f5aa30daceef3/16630146171.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/malozopulekijegogoleno.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613341bd2c579---86485976527.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/73539582142.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/11540333396.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab4177222---wuvovexazuvimujigugikuwi.pdfIn PDF document text
    • http://vhshf.de/File/11820120481.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/94442490838.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fd4b93bb9efac644b1c65ddfa41e58b4/15154890662.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/xeguwagamexilofedikafit.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/6a561eae32605cae76a8eaa7cc037436/zolikalasekuzexunu.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/34549905495.pdfIn PDF document text
    • http://matras-devison.com/upload/file/tebulodidanavejitir.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/75617419851.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/22210345024.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ca80d768b80392e2ec78982b4448a1de/66214690586.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/gasudasetiferuzefed.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/46670983088.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fovugadinagitufeganixigol.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/22221844220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=download+film+the+room+2019PDF 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_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 11000 bytes
SHA-256: 14739fdeac7e201e3a618d963912e5dd6b9a4fc702269ba107f99f302c719b70
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 20160 bytes
SHA-256: 737657dcf965541466460cf43ba23fb4c0f2287a5a30483cc7f53617fd914551
font_02_sfnt_off00012da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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