Malicious PDF — malware analysis report

Static analysis result for SHA-256 832016ec15b749d7…

MALICIOUS

PDF

146.0 KB Created: 2021-07-05 03:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b410d771661a8c5dcc2fbcbb54f5d286 SHA-1: a5c4f174c01defa13546997b6927fa181725eb5a SHA-256: 832016ec15b749d74235aea91ac032a0262bc63e1ea794da1b2f6f7166e80477
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised or disposable. This pattern suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 6

  • 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.
  • 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://saltokisport.com/uploads/files/fokubade.pdf
    • http://ranaghatpchsschool.org/userfiles/file/zutowatatelupimeputumox.pdf
    • https://banghenails.com/upload/file/banipitim.pdf
    • http://randalljroutson.com/clients/44711/File/xugososakanaxu.pdf
    • http://adaviestransportltd.com/userfiles/file/duzuzatisomenabivoruse.pdf
    • http://www.bufolari.com/public/immagini/file/tuwabowagewo.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083733dc09de---medodurimonor.pdf
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/jitololeja.pdf
    • https://bodegoncriollo.com/userfiles/file/58315818979.pdf
    • https://anmoul.com/userfiles/file/20247382559.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a33c34263---filagiduxumijubebokotizox.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85f6c3526---20897543180.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/xomuwadupuvixilo.pdf
    • http://ahchala.com/img/file/92071397537.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e2cfc7950---lorebupalijoridinuriwapo.pdf
    • http://santamariamikado.com/uploads/files/zefizad.pdf
    • http://amoy-art.com/Upload/file/8941609615.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607957a6942b1---gamoso.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/m7fc3b82l203t9t25cq0u2jdk3/jobezidebexedipebujo.pdf
    • https://alutat.com/data/file/gupagej.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729b228e2f1---48082529014.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/de177bab9995606cd3e9446fece7d0bc/dimedexizimupisisitobusut.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/168fcaee5cd38ea92f1c4d76ae498eaf/juvubikafipadigu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=operation+research+assignment+problem+pdf
    • 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_off0001d90d.bin
79dac3a8f9ac5c987179a09ae3eed8408a4f00a1d3fa29c04a28cdb3298df263
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D90D 18132 bytes
font_01_sfnt_off0002086a.bin
82882844b259570d5f92d497b9ee0d7e5aec87ea5f3b389b6220e1d2b1f70300
pdf-font-stream PDF embedded font (sfnt) at offset 0x2086A 11232 bytes
font_02_sfnt_off0002221f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2221F 16792 bytes