Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b5335c4a6a1ef5c…

MALICIOUS

PDF

138.5 KB Created: 2021-09-03 14:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba323c0ff47275f2ea8a726ed0ebf988 SHA-1: 4279dd0bc1ed2204dcf2faf8a51828026949260e SHA-256: 5b5335c4a6a1ef5c57b5f9b8c54938064a87992d9fc02d28d4ae879f26d20b55
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160afc40ab8403---wafixafefagirulukuzag.pdf In PDF document text
    • https://ajitcoatings.com/uploads/mosukupiguvuko.pdfIn PDF document text
    • https://norservis.com/files/files/33282064441.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/moiaovhld7ev8pl11rio14lukp/28090844679.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/bodofigukarupuwipufe.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7f8e932a---85729253674.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/iofeu4estr17ki1f3c7m486urp/15513719158.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/jqggc181llsmlq2cjpu0gjoq3o/lifes.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/sebesezumironu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fa2c35cb5deef9052655b8cd6398b5b/18149110043.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/buvifonitosufe.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/tisizokigagoveb.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fipamerilonolebu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee567d4b6da---vikejewigovujabiserib.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/ed56af6115b4f5c4a86ca282acf95e1f/48413292393.pdfIn PDF document text
    • http://vinmexindia.com/uploads/xumipowukadedolixunonub.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1eb84eba67f43f703509ebe5c1726fea/59467623525.pdfIn PDF document text
    • http://ecotrans.vn/upload/userfiles/files/23039304616.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/jubatulipafidozol.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/jasupexuzifatanox.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0001115ef955e0699eaf59571f64bf66/tozajafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=psychology+book+pdf+filePDF 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_off0001b6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6F4 20612 bytes
SHA-256: 39b3b28572ff66533da4de9ef3f4bad30fc9dab35fb5cf7e6a5f29b183e06c31
font_01_sfnt_off0001ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000203ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203FF 10780 bytes
SHA-256: 66faa68fb91dc2320463289f8acf7fa6c844c0eaae907a2ae6195f5ef934c963

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