Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb042d446e2b450…

MALICIOUS

PDF

80.9 KB Created: 2021-09-01 14:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5f557900a93fd86de77e1cb9b721ddc SHA-1: 93887c86ffb894ce67b8d3652a1b0e98d339ee5a SHA-256: 5fb042d446e2b4509a3600dee6c37511e3ded6c04c989894c53396f95f713558
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and exhibits characteristics of a credential harvesting lure, specifically targeting Multi-Factor Authentication (MFA) or one-time codes. The document contains numerous links, many hosted on compromised CMS upload directories, suggesting it is part of a link farm designed to redirect users to phishing sites. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, combined with the MFA lure, strongly indicates a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/18190593211.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a715033e6---ronatumalisinufaben.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8912130a84dd28d7e5b47dc4876f05f4/87967116709.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17f4e3af7---4642369055.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/15616819100.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/13249801646.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/fupidopavolem.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/82ea5b63126e2ba7133ca800c16dca5d/ropasudexutalikefoxidefe.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ec539d04856---linozul.pdfIn PDF document text
    • https://aitalk.vn/upload/files/wixozasuvijuz.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080389a0ca51---36379428417.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/kodaworazoled.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/5285275728.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c8e1a1sm1fv23ue579e8cku834/fidasolomobebazudizaposa.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/zidogavewifisazovetoxet.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/703232385.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/wavimabavoza.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/vipor.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/miwetiwureri.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/sowabukisoxenubukejumokik.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607070942c1f6---soxolipovenobiwimam.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/ralexunudanira.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/022129e6c01404c52ac4fa52daddad05/25478263364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=poison+sumac+blistersPDF 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_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 10632 bytes
SHA-256: f393d236b378fbd340e0d0ac1aa75de13fd5bbed46192f85aec447bd8dc5c35e
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 17012 bytes
SHA-256: 026378df4d3b6d5d2b9d0dbda3fed98a9649bd75690d689424e101efd9707558

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