Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c52ab0745a76a0…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 19:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37ef5311a5417f2ae0620a5b930fc32a SHA-1: 90cf8be31cbf769188845c5e4d779aaf79287872 SHA-256: 02c52ab0745a76a03418fdce1048fadee0a78333ebfda501630b337744e3e672
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. Heuristics indicate these links are used to direct users to external resources, with some hosted on compromised CMS platforms. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://angelojrobles.com/admin_initial_test/userfiles/file/70905962721.pdf
    • https://xo-sound.ru/userfiles/file/radepifibinekeluzenuf.pdf
    • http://poiskvod.ru/images/file/jinupivopiwaguwotamewive.pdf
    • https://aspaeng.com/files/image/files/dutazepenotakagofu.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd160a883a---nexikogutisenamonobosur.pdf
    • http://tivatijapan.com/uploads/userfiles/file/lavorojididunof.pdf
    • https://exporoaster.com/app/webroot/files/images/pages/files/99574683838.pdf
    • https://canevastoilestjean.com/upload/editor/file/loxesu.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/1907935c21d8539c1c977d818f4c6398/zurobikumiz.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/9e8a8dead8a34bb88dabfe2623242f95/livatokugadurugisupuxa.pdf
    • https://harryfok.com/ckfinder/userfiles/files/35116116130.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609419f176b2e---baxodafusivutex.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607583d52c276---44587302077.pdf
    • http://gramercygrand.ru/files/file/gogokirimurenaperazudi.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/b6041dc642bd0138889aa3db39347771/nobuwuwaz.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/062e8a4d7ffcb810d9711300e46497d5/83660658508.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b177a00e---5048501601.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/722c5627555664f93db97335eaab3082/nokugireripotimupiweruf.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/1c9dd471ff77502e00ebd05e7d4b75a9/423265037.pdf
    • https://33mobility.net/uploads/files/41281458605.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71107d41f---49057338560.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6d152b428f2aaae7cfc1992664910604/43062829389.pdf
    • http://envigest.cz/upload/file/16143207580.pdf
    • http://nakajima-ya.com/upload/save_image/files/59379842729.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=past+and+present+tenses+exercises+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_off0000ed5c.bin
4c4c7695785f6b8c4798278ab115c3edc09dd8600f6cdad18faead5211865030
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 10548 bytes
font_01_sfnt_off0001058b.bin
cc62190d4a6f0ccc4c9ef72e2c4e882bf16682f29929f86233b241f4e8e79624
pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 17176 bytes
font_02_sfnt_off000131d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 16792 bytes