Malicious PDF — malware analysis report

Static analysis result for SHA-256 588404aa6a4baf6a…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 02:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4379a2ba68f41f0766ef6b00a2376152 SHA-1: 516a24bef278908c7ff464ad7fbb30c0e0cefbe0 SHA-256: 588404aa6a4baf6a623bf1222776554db1d8b80f5fc025c41a87d655625f2c45
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883862d6aca---woxunejej.pdf
    • http://n-production.com/upload/fckeditor/file/85116766402.pdf
    • http://duonglaohanoi.com/userfiles/file/rijidokigutulip.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa69e3de58---ranosuzir.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3abf4a431---44553977418.pdf
    • http://mobilesamara.com/img/files/file/fegoxi.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/c3757u7uha7rr8k8ifk5g4mefi/fumexujakisikufini.pdf
    • https://vijyaiprismcrm.com/userfiles/files/pawas.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c77456837---sedokovavuzininog.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f195c34---tuwezubobojomapudak.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2976810c0b---widelak.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987b143d38f---dotoja.pdf
    • https://hgb.se/filer/file/wufekaxuzuzisopuj.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/vutorolaf.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4c4255ca5c0de1394db8267759acb0cb/tejowejijuxepifefozokatim.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607373b337df9---kekage.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/p7ch4m9u7sl3bdicpk567i0j0t/bedodadirememomokojutug.pdf
    • http://asiadomainstore.com/userfiles/file/53444409979.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2aad2b286---25353550267.pdf
    • http://www.aadhar-interior.com/userfiles/file/kefivifirawudawitu.pdf
    • http://canhtoanland.com/upload/files/48491502465.pdf
    • http://chingyi.tw/userfiles/files/vuxinet.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae23e4c8ce---fuxiwinazaligure.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=old+man+at+the+bridge+question+answers
    • 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_off0000e85d.bin
22adc944201e4a01a4f368769e7801ef6e76f8f909fa6d4516acfcd0b1a700c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 18880 bytes
font_01_sfnt_off0001196e.bin
240ba5a9a613fc214329d51192fb5a1f0bf878b50252aeb20d7e97dd18040499
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 11192 bytes
font_02_sfnt_off000132e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 16792 bytes