Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9e68b0867eabb8…

MALICIOUS

PDF

83.2 KB Created: 2021-07-09 22:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: eb42913fb9aae9209fd0dc585eb48587 SHA-1: 90394c0172bfa9e238b489196835621382269c7e SHA-256: 3d9e68b0867eabb879674be90e40fe7d1942908862f6fc57be3a7ca0d599091d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request, intended to trick the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://philabc.ru/uplcv?utm_term=pay+scale+chart+2020 PDF link annotation
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/e5948e2d475f4ef2b2f5e4d98f2fcb06/tuwemulajetugubasix.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/81thmo7s8m54l8f82hb8iehu3e/19135132078.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f3d72385f---34939138768.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/3517531691.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/119766639860922975d9c12.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cda9695ad---sikujonixulunupokawedop.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/13611568831.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf43a2156fb---44561872667.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160872f5937877---lebip.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/89076341619.pdfIn PDF document text
    • https://kristinanamaste.eu/files/23347615132.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e62aef4d094---58449943934.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0e1c07028caeb061ce415d772daab9d5/98796103257.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e3950f2c---37244654403.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607823c3d4fed---82739574462.pdfIn PDF document text
    • http://gabortech.comadmin/file/9924176432.pdfIn PDF document text
    • https://emprenderem.cl/files/97682105854.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e4cab83ae1c6f131e09ed04701a63278/66714975423.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd52c4b32---wizoli.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a9683cd56fc---fadewuzu.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/tenofevuted.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e84618e630---wewidutunagutikexo.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/40758b4046cb72aff1218bd436669f4a/tobajozetum.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_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBC 10368 bytes
SHA-256: 8f61fbe0cf89dd2964a7bdf83dad62665e54bd9990c81ed486c2d7d9c0ff4ec4
font_02_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 16380 bytes
SHA-256: f33c411c974435de5dcb1983ba287b6d381b428dd34eff13d8c17d0bf8a0c03d

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