Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd7394dae4bf187…

MALICIOUS

PDF

161.8 KB Created: 2021-07-08 00:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 53466dcad34b6563b2048c89d3567a77 SHA-1: 057c02fe1a6efeee616f8ac42e6fe4676c76d2e3 SHA-256: 1dd7394dae4bf18774d0e75bb6b41f850d27f8d62b27b688081be68a6b9eff70
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. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable domains or compromised CMS uploads. The embedded URLs, such as the one pointing to wurstfargo.com, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/822f2e67fccc6e307647ff11a707149a/6467975472.pdf In PDF document text
    • https://iohrp.org/f_files/files/sakebaxogudi.pdfIn PDF document text
    • http://fitviewer.de/files/file/38939438228.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e8e7a1738---4368727486.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606f82ab36cf9---84971318414.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/bolujeb.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/70742152679.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adca1dc27b8---23523965103.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c3a6a4ed---xerozivo.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/4f9e6f4b4274434cbf5089f8c3a5d422/16138498491.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/i60dsejmp7pckk10rq11bqdtpn/17336919664.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1f3edfd5---22974560135.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060502465073499.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f71e1c947787c8008097f17db385e93c/goriv.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/89971197983.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/zuvojisokagemebenivanuni.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bd6bca7c935dee0ea634a41f17b6fefa/sotiwax.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be6c5d061---97745635335.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/88501547563.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/xizubugigupokinot.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519210317451030.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/37181226900.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/wederor.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5e9cfc831ef3269585cc25937816769f/18796812199.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8eec917037fd60b610d87ce514e786f0/zofatokaxojiwes.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/88c2f3bb7bea8beff288c3e05922fdfe/73080256699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=meaning+of+reboot+in+phonePDF 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_off000217e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217E3 18672 bytes
SHA-256: b797ddaeb00b3aedb08ba09a8d73ba04dc2b5c6c08db855c3ea263f023d9902a
font_01_sfnt_off000249d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000261eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261EB 10556 bytes
SHA-256: 3f89fdab2f19a0e007b984bf5f863d819e98b5c55a6cb706fee63b7a0a908666

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