Malicious PDF — malware analysis report

Static analysis result for SHA-256 346890d906d3e111…

MALICIOUS

PDF

131.1 KB Created: 2021-08-11 17:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 887a1fe36819dc9a3df43d42101d56bd SHA-1: 021d7fb1b7b36ae60cbe17c56fa66fda3e46afc1 SHA-256: 346890d906d3e1116e1c731e295f8c5017ea57208b810eab57870a836cfe1e5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to lure users into downloading further malware or engaging in phishing activities. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6c976de3b---33192895676.pdf In PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/59997570459.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/rupejikejuzirozepokev.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5dcc82589---34012320953.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/45812091072.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160823a2971dcd---noziforazol.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/59303028536.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/66073429959.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekivowutebavamopemuv.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/19810702433.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4a3qr903uhflu08ko9106enuvb/fopuwewimuxinukumexani.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/sse56pb4bk9mkl57jgpkdjagh2/dikitixiwulusaxuwazuma.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/66972372603.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7312e6cd6444124ac4925174d5f79a30/koguzuvat.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/rovibemugow.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/605b95abbae59f1170d7498915cbc295/wunoferafu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4c38c8f4---pigugupakubenopozitej.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/luzaxenujogizata.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1bc50f202---zonojixanefuw.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/madexizetepugini.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/mulewofevasazibire.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/25146347354.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610a12bfc4f5e---gexewu.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/demafesetofepefilofiwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=great+writing+5+5th+edition+pdf+free+downloadPDF 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_off0001a07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A07E 17204 bytes
SHA-256: 5190664bee9a826e190f52bad3ee4d897b46ab460dddae6d923664b86eed516b
font_01_sfnt_off0001cd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD6C 10868 bytes
SHA-256: 2b81e4ece5366e34eafa944b2baf76b7eb162ff09dc3c3b802e4161403aa2e8f
font_02_sfnt_off0001e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1