Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a9f6e13fda14f1…

MALICIOUS

PDF

109.3 KB Created: 2021-07-03 12:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01d59726d06df7e799644423b5916cee SHA-1: cb24eab6fab1973d8f274257eefeedfda28e2dd8 SHA-256: 79a9f6e13fda14f1271897085bfbf1b0ab343d4208a503311cdecdd65bcaa50b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a malicious advance-fee scam lure, likely intended to defraud recipients. It contains numerous links to external PDF files hosted on various websites, suggesting a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://anhuicrew.com/upload_fck/file/2021-5-14/20210514152227939686.pdf
    • https://aduanaldelvalle.com/userfiles/file/55709673466.pdf
    • https://healthmatters.me/userfiles/file/mugexo.pdf
    • https://mudraconsultancy.com/uploads/files/sekugevuzukure.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608616fd6804a---62090800072.pdf
    • http://xboxheerlen.nl/userfiles/file/mugakawanukupi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a746130cb4e---modifojigujajupaxasufe.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1ea702ace0ca068ea807a02135f16454/wezebonoxe.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ab82e8d1e---33589605397.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882862eb31---zuxewajuzajumowuno.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3995c51f4e674c1dba799b25934ebf9b/lubokumigogavajugilaru.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cafaf3bb5f---18865401219.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/h9qm7ne336q75uuv7ms49d49or/63841609359.pdf
    • http://studiodrago.eu/userfiles/files/19496371465.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160889ceaca71b---82369729588.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b663e3dcd0c7b781260ff63e05e5b00c/58897752839.pdf
    • http://bumsnab.ru/uploads/files/28815412966.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/098f412d80b1fbcee594042845881063/kibidedad.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/qit050b8plniipric3iaurdev1/14096748520.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094b91b9a49d---10849954778.pdf
    • http://sys-svinding.dk/userfiles/file/poxopupirugatixefijigosew.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3357558079d7e09e59d41f887df84ca3/70773644816.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/dd92fb9ea9824623104dcbeebe51fb76/91063705433.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=op+amp+microphone+preamp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001482b.bin
158983f1d94eb53722a482fb29306d8ebceef7ea0f0981ab72896e14cf8809d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1482B 17808 bytes
font_01_sfnt_off00017764.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17764 16792 bytes
font_02_sfnt_off00018f7b.bin
f53a9d09d74e38043c61c6f6e6182d6a70906ff42cc9638d012004f0c8201154
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F7B 10352 bytes