Malicious PDF — malware analysis report

Static analysis result for SHA-256 b906ed60c17b0999…

MALICIOUS

PDF

82.5 KB Created: 2021-07-01 22:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a0374366aab95004b66c227f769d52f SHA-1: 689ade8387c1470ced27faa3ee73955d0f345b06 SHA-256: b906ed60c17b0999be798a8fb7f9d2203d467e30a75ed7404b95336c8b41d3dd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The primary goal appears to be directing users to external resources that may host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce37f541ec---14693515092.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cc72d97a3---19023738881.pdf
    • https://alatheir.com/atheirwsfiles/file/22137194219.pdf
    • http://anhuicrew.com/upload_fck/file/2021-6-28/20210628062841692753.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a27f6d26b424450aca1c0a592acf528b/ruzuretuwutesogabuzilul.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f88918606022ec7472c4b997754a9477/69553625059.pdf
    • http://gleneaglehoa.org/images/file/36704148047.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bnffdtgf5mivgs5mmikij857bo/vivusuzotodafafawibedi.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f564e33c---13858248064.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95383c23c6---11313895365.pdf
    • http://ciaooo.ru/uploades/userfiles/file/puxinugupuvebixipezotuwi.pdf
    • http://www.pattyn360.com/upload/forum/files/49492191233.pdf
    • https://rajakeempat.com/contents//files/37654532176.pdf
    • http://ultraljud.nu/bild/files/77225730764.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e43e5ba08c5af9018d1bba1b2748d18e/63268548684.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4if1qc6mh8atcmafpvjpqv4h71/52075301457.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af78b9bc2ae---85330582973.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4299de2a52257c056d83615ef5a7f9dd/lezeliwofuxidonotulutinan.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7pd3ko0qa0k367ru44nao690vi/vugedigevusixipasotodika.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24665d439f---10306254143.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f23c68ec1---rudufupogi.pdf
    • https://reniuved.it/file/xikipad.pdf
    • http://adveotec.com/img/file/duwilebelikej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=upda+electrical+study+material+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_off0000dd5c.bin
577e4dc9399b92d17ecc6432ef96f64d9393f1a4358a01c399e68353fcb7d3a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 17600 bytes
font_01_sfnt_off00010bd3.bin
bd8134fa2a604c59b7d290b3418172b268ffdd52566e9a03d7a1df258ddc0f02
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 10776 bytes
font_02_sfnt_off000124ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16792 bytes