Malicious PDF — malware analysis report

Static analysis result for SHA-256 4394792565eea887…

MALICIOUS

PDF

137.9 KB Created: 2021-07-01 19:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 552c7700fa8ad0599d3168491c1983c0 SHA-1: 24553de7d1f1fa63b28195c22b0c859f022bf753 SHA-256: 4394792565eea887cdd603240ce3671cb96fefb1883d9f20f8d5bd2a544ecd03
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress plugins for file uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the sheer volume of suspicious URLs indicates a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=panchatantra+is+written+by PDF link annotation
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16076343cdcd12---7591597101.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/11013200602.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/pulvs01295bcflcjimelarbs9p/xewegamarimuneduleberuf.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/jt2b9c3nhudiet0tj89l6i30t7/jojuxavozoj.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/41874241346.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/57448122759.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/bugozudikijajozizabaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608615a5ed0d0---47093662030.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/r13scmh9ucqujuf6epvuioqni1/6261524216.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/lonetazi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/d4a2245cd607cb0ea22b2dde07907f19/mibigiruj.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/defuk.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/favavogejidobazojo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4d1a556fbe1c5c3f45c543ba8a593cd4/pufasobumetogek.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/finovobigixakodumus.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/706407f2417227d21a1c517eb0b60011/60562754283.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d29fde5c38a14a84b0ad46d02a1b68fd/98279495516.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d675b3eb2---nawavinume.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3398357d1---61259611927.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e475c2c481---60719436214.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/27440326344.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bddc1157f39---14238860873.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D11 16676 bytes
SHA-256: 8e53d0df7606de16e0980d4e97148545ad0a548d345c5a44f5d3f0aac34c0939
font_01_sfnt_off0001b4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4BE 10500 bytes
SHA-256: fa5d66d8fe040e556d47eaca791edbfdb6ffe68f627fafd6d20674e4b973bdfb
font_02_sfnt_off0001cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4B8 22104 bytes
SHA-256: c41b60df8726b9acab7a56632cf64d57bb4f541f5ca2a7c7b9b7035e45a8b4c2

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