Malicious PDF — malware analysis report

Static analysis result for SHA-256 efce40f185cd8c49…

MALICIOUS

PDF

82.5 KB Created: 2021-09-04 10:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 069773ab26bfc7b0525e76d7b9967f87 SHA-1: f546633d579f1806daff6c143297f81b58328865 SHA-256: efce40f185cd8c49255b3057828a06b7209645de7e79bf061baccabbc5b1ff20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h86cb1pkqcqpjlbm53v2h5ume5/xaluwotejopuworozon.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907d6b30c1e---24698579631.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/83761058287.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/52813727302.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/aa8f0562f51c0d21fda123ae30b60d48/xumoz.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b778b6f41---46255523133.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/46184622360.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/09eb38476daaabbd63f5a664b95ea30c/nuwomilofetabivefunasojep.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/vavega.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/seriziwegubijunuwisetuv.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/xipobefeg.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/pilimirimivuwopise.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/rozesekubifobebumeriv.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/kinavax.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c225e8af6c2c5ed4981d685d393eb409/pagopadudirebov.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876fb7d0f36---xafugubinibabal.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/referetutok.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/68430153753.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/zaziworaposate.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/venuraza.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/2990141655.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907a0f3fa51---bufegetafevakefatufuzu.pdfIn PDF document text
    • http://apsons.eu/files/file/74691686986.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e175c408b7---fower.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=azoospermia+tratamiento+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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10656 bytes
SHA-256: b52defb182f31cee4ed58861e4647f45a7dcbc5cf37faf45df346b03b33f046e
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 17948 bytes
SHA-256: 06dcfeca048b8b150c8c16b265830ee46df9b015427cc3ccb609579fb3dd70c4
font_02_sfnt_off0001246b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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