Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ef81e78adac526…

MALICIOUS

PDF

84.5 KB Created: 2021-07-02 00:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a60421c91da999613a4cd2df1208614 SHA-1: ba91efbb6d3d9520006eec359451487c32efc7c0 SHA-256: 34ef81e78adac526094b29ee6de80807e0a2ed66a260acb874300a9325737ac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure indicate it is likely used as a lure for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609155f1b8884---rezanewolek.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/33e1f3f3e77dac9e21e83a086ee4062a/6198531750.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/dc2d737cc3898fced386b1b741561aec/29025223250.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/luqkd2f6c9dh67qiioalu2r9k8/96937320986.pdf
    • http://tecsun-moscow.ru/docs/file/jipamozolekeposotisib.pdf
    • http://beachfirebrands.com/userfiles/file/87996543149.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bbc9f48f---tidebajuboduxudewowus.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/speaokubcf9bg6ns7eb8uvr9ae/zavoditijogofese.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c183d7f24f7---68270471106.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/e64d31a7hpkngbfprek7766s5c/36216345446.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8260942a20---vinajojete.pdf
    • http://tremonttemplemacon.com/clients/862779/File/mutimiwetesa.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a254c45fee---pulita.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e6a151336f7fd5004e4caaec72b183db/rugulilu.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/34012407966.pdf
    • https://verandapattaya.com/userfiles/files/44370621615.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080844d3d4cb---degamew.pdf
    • http://icltindia.in/userfiles/file/12391366313.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcaa4ea9a5---49306901339.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/jimisonesivirubakagiji.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd2406f50e---wunosavevi.pdf
    • http://autoscuolavalerio.it/userfiles/files/32463796318.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/scoa0ha4adsutj7nq4vpu0ne2r/revapuwoporekivasinebana.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/aver641ipgluu1fn95cstr6778/nagumalozegimubexufuk.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/114bde663ae2913a28d974f7fc1f6143/34769580644.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=10+minute+trainer+meal+plan+pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/575fb42c288d35493ec74ca8db0f65e7/16870545894.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_off0000e5c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 16792 bytes
font_01_sfnt_off0000fdd8.bin
1ffbd213c302759c77c2f6d1d178d253f83918f8560fbb44f1dec554bb9edb60
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 17260 bytes
font_02_sfnt_off00012af3.bin
c9b5acf646bd78242915d11b643bbd53c0d071cc645332d929ee5205603f09e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 10548 bytes