Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f0cf0d2279deb5…

MALICIOUS

PDF

94.4 KB Created: 2021-06-30 10:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2e7dfcde6d7e23b70cf78da497cb7a7d SHA-1: e4847e5f851594925a2665ecab5e7c287a24b118 SHA-256: 42f0cf0d2279deb56a4ef2a8c70363e369967971f555d8581a8846ba4ddfc129
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to host or redirect to malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://vansuloi.com/uploads/userfiles/file/80491269633.pdf In PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ssd1oig4vusr8aksj4gholjdev/96473814581.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/54815065312.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160789cd9bb2d7---8623736532.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc7a9f1da---bawoz.pdfIn PDF document text
    • http://sgpeo.pl/users//file/24257142973.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/d4d9c9782b90b20c3241384112716b05/wararoxozesosivo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/pdrap5l80e6aof18t8dk130akf/bikopux.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb55b403e---66220591507.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ihfmlpr1dsq2b5t2i6n2rd1eni/wavewakegexa.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7rchtg4h7hvc0vlk7iit7jv2u1/vanupenuw.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36b2b6f0a0---96539792206.pdfIn PDF document text
    • http://thaide.org/userfiles/file/jarazobezefiwaxodeba.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/fomovasosegajuw.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/guginurilorixevu.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/ludewitefirulox.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/81316196660d07fbd2d308.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/3342795652.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6453e960f5ba401dac951b5912a01d5d/pobinetupemigujezodek.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad867b9ba47---48118922287.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5a5d82a9---61949968636.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621732966.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/62716802584.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/97747930804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=best+oven+baked+spare+ribsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 10692 bytes
SHA-256: a7aabab2af43efd260d3c036b26982fc0c60ddd2ffa341de520c5f5d869ab40e
font_03_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 17896 bytes
SHA-256: 4ea9eb7bb3d48ee4f1fe3304fd4c0e873d7d7d3ac3b69d914f10aa2f3301ad1b

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