Malicious PDF — malware analysis report

Static analysis result for SHA-256 1660792bf0b9199d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 04:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 893f43480a32347d109bd75557b414e9 SHA-1: c36e38a5fa74fc3a10cb6ab259ba902dbc4429a3 SHA-256: 1660792bf0b9199dda9d42826b653b1ae7f9e97032c049b2bdf222f5c7fda0f5
156 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of link farms on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0128e21e84---46643581383.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6c05db38d3c54bb5c7deb27bd90b689a/22515585321.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/78264178572.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21233714d5---dogosadefibebeve.pdfIn PDF document text
    • http://pi-consulting.ch/download/ludizugazediji.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070d248a7d9b---rameworawarudi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7bb73e3d501876c9fd56ecf993696f8d/zemigijawujapurodorukur.pdfIn PDF document text
    • https://cmoretv.com/userfiles/daruju.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/wowevitawatejir.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/nuxinazakomemopinogi.pdfIn PDF document text
    • https://mihalex.by/files/files/vesorijibim.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/pifadufonikabinolo.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/kufuzawoso.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee0d43f6a---86222527181.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160e8603b224a2---42459000741.pdfIn PDF document text
    • http://cwesp.biz/upload/file/38159907826.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/witavupabebanavibarakivu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2vl9ofh9jl6m9aocr83hgcbhrb/vijigitadizopujilozigi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160833b2808cb9---51971025959.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/nevofegove.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8fc0ea5d8ee27a51bfb919187fb24b01/64561030146.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/tmfr5jaq8pses4re116dehnmk8/wuzuf.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ba42689bcba71cf12586003f3388eed5/juxijumap.pdfIn PDF document text
    • http://compsult.net/userfiles/file/vetubaxomepipinojelida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=valores+laboratoriales+en+pediatria+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_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 18116 bytes
SHA-256: 2f3f01b2d7d160169f24c0dcc1278825ba3bece2211b2f9f74da970abd7699ae
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 10600 bytes
SHA-256: 576b7d12245a0bd33d1928d4cc98fa1d962a120beba3b03c7b54ba6536f202c1
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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