Malicious PDF — malware analysis report

Static analysis result for SHA-256 99308e76a7a5d9b0…

MALICIOUS

PDF

84.8 KB Created: 2021-07-03 04:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5904451de678b59e993eaeb95a5eaa90 SHA-1: d9d0320b67db74f8b2872ffa3e258c937c42158c SHA-256: 99308e76a7a5d9b0e975505007dbce5a14df9e21214625ab5c92a7139247ab04
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/6stt3i4hudgtfvptae4p4k1io4/3303306900.pdf
    • https://bselink.com/userfiles/file/50217482212.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e5c7c44e5d9e92bdc84a26e2e99027ba/12856189078.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/fekofukiron.pdf
    • http://stigstudiotecnico.it/userfiles/files/xusotawizow.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3a9d7aaf---faworobupojikotow.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0b9567b9cf5c778e3b9d5fa6e5e14d82/74865855311.pdf
    • http://insureacompany.com/userfiles/file/12956122225.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/xewufevamerineb.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/25675456170.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6fc588f1e6d3fc69de9f3d1bedd40c59/mawidaxezukumenosam.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607236decb515---dimuxaxoze.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9ec4fd88---gikinefudisurupizixoj.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a9915b4f584507498548ca572862f92c/50867817103.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/dozavowepajekami.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/c51b022446dfa7e33f99e92fec4e141a/55419612201.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67fe137c8b---73720980570.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608421ba86012---34046303636.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b5f6ad6a3---38642826475.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3h6024rq8a5dci35trqjq2rrfa/mejojapiparawikereruluw.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/99273af117a51ae6f41b313c8f4971bc/goriwisurajoxebajinilud.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa131d62632---narebozubaw.pdf
    • http://classicalgardenfountains.com/uplds/file/46655484970.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c250702efb4---xevit.pdf
    • http://heyumpnd.com/userfiles/file///58159162988.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=aphasia+icd+9
    • 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_off0000ec84.bin
8aeeb8297ff85ae212313d69dc2a98ce7aa355429819797c6deadb96d659f598		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 10160 bytes
font_01_sfnt_off00010368.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 16792 bytes
font_02_sfnt_off00011b7a.bin
eb1066d4cb6437c73b28868f2521fd01ceda6ca57ad5c73788a0beb89b84bef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 16404 bytes

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