Malicious PDF — malware analysis report

Static analysis result for SHA-256 2367c3c87b7c18ad…

MALICIOUS

PDF

71.3 KB Created: 2021-07-07 04:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbaf3d5aea07abc371ef6d3d7057f56b SHA-1: b4b3eb1f1e4dfff2f0fe16418cb062d400688ff6 SHA-256: 2367c3c87b7c18ad262cf6ea03abd336b74d4dc6458050ea91fe47924364596a
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest an attempt to manipulate search engine results or distribute malicious payloads via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://emyorganizasyon.com/emy/ckfinder/userfiles/files/dizagajobetewugafo.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df73deddaa---54074620382.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/87263545883.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/fumoxupevinusugawukelibed.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b406dd71938---73027830129.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b881088e1a78e02e53361cf7347a86e2/83004812150.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/xezigarobawododoxated.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/96954262247.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/paxiwikisuxa.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zavuj.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/goliwixinesidetoti.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cff87ad5a71---99470603294.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/5b5939daf28b370da1b0f012eaaaf75c/fewakafikojorejenet.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dk58d5liuptftu1dr250777960/83521215328.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9b26a21015ba8cfb304e9d5e87361d19/6433858761.pdfIn PDF document text
    • https://semut73.com/contents//files/jiruwamejozade.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/230a1e924318bad15e8beae988ac8412/3248350251.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887f8b4c8f0---65591692244.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2f5600b5f881afdba939feb425ffb646/61879982638.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/64474404539.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6daea121f8---51462061289.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tixiwosikonelisat.pdfIn PDF document text
    • http://poultech.net/d/files/57544469422.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/45706118896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=annie+mcelwain+and+poppi+monroePDF 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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 10476 bytes
SHA-256: cdbad14d57cf463c50576ba0134d9ad1f9ce47434b5bfdc9fd22c21dacaa8942
font_02_sfnt_off0000e70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 15868 bytes
SHA-256: e3c86625909d65393b42c82b60a5005c984c246a0b8a53c6db5adbee437cddd9

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