Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4caf9a91c9d5449…

MALICIOUS

PDF

71.6 KB Created: 2021-09-23 23:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3014474971e8798c2ba49a785c6248b1 SHA-1: 8d4cdb852d3203716c96a2582c9cab7d4d8999f7 SHA-256: a4caf9a91c9d5449b6e26f4aee141dd02d83f2f13f9bf4af60f1256a417ee2ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=punchline+algebra+book+a+answer+key+free PDF link annotation
    • http://mawratanews.com/armedia/uploads/files/zoduroroxotepujelipexuw.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/65bd2acbf8e0f6c9764ace58fe418bc4/bonipaleguzesewoja.pdfIn PDF document text
    • http://delve-cr.com/uploads/nuvejapuwe.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee628d43ba---povoliluxexaropa.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16148553f2b29d---22031248619.pdfIn PDF document text
    • http://apicn.net/upload/files/semazedepoxoremotow.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/divulujegikuzetojeborofar.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/jamiparitirobeduxogu.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/68109572750.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/28784173056.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/15418470908.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/wagedejepowazekisabizodes.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/15777267340.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/wajusexane.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/bojusokanivikavegufegon.pdfIn PDF document text
    • http://elskenecologie.nl/files/39437498167.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/godevuxesaremumewep.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbac61cc6---78101791175.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/18013398769.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/mijitidijibotenubarumo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469ece669db---vulibejuko.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/28497740254.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/ninijawijamifobivotupas.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/50474085031.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_off0000b79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79C 15304 bytes
SHA-256: 99608afb82ac989652ce2f64e1f5385b4cc3843151c0daf83375862faac66a17
font_01_sfnt_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 11052 bytes
SHA-256: 9d81779228ad3f7607228ca155d010dddbb66f9454a6df00e1bc0b1ed7f2edb0
font_02_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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