Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5785a06a8a8d7d…

MALICIOUS

PDF

73.8 KB Created: 2021-06-22 15:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 852eedaace23e9832a60a6c70d8a1526 SHA-1: 0700ff21a50f23190416f491c573805e4ddbdeaf SHA-256: cc5785a06a8a8d7d6dddd63857891eebb448a77a8ed80f7875079776f06e947c
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 contains numerous links to compromised websites, suggesting it is used as part of a link farm to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16075c32bc1166---58084933766.pdf In PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06de9b2ce6---2356717107.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/11559825308.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096363e78907---vujupoguw.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210529_6BC855D9A79E7D5E.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/wanevorisimodivibe.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/262ee757dd119c15036eec51c87fecc6/doparagatozapodabegimup.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/51501553761.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/09a1a1ddf4061b6aab927c116c057787/muxilu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f2c15c5d49f3a138d5f042a127a960d6/komarofulanagupoza.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/c7e7398b22dfc4f797ebacb0eddf2d74/76725173009.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/72435411160.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/56647783237.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160940975640e8---75238419875.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf346de76---nerakufuvugezavozojurape.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/03505f0e29f58f6375e5d32dd7dd4ddc/jewifokexujeluzalijajazon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=precast+segmental+box+girder+bridge+manual+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 5684 bytes
SHA-256: 4d50851b9eef0b9828292a940a7013ecb77e3203b8a97013312194e8518c8aa7
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 11348 bytes
SHA-256: e46e0f533ae2526ed1bb856b459b7c1f9afce5da154bfd5ee5e650538ce99d28