Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43317bf5ef2f4ae…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 23:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b43761e200f3b187e7f63bd955b61a69 SHA-1: de751fd55f48444a0c1a4181e6bc1b88d34b5c1b SHA-256: a43317bf5ef2f4ae1525121258b0e17cb987bc1fd43495227a99bebad480dfa7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://tribo.kz/userfiles/File/jasunapuvixibas.pdf In PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/1910321461.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20216241129562318.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ec2d5a032---sivinizobebuvozofimuz.pdfIn PDF document text
    • http://mp-journal.com/media/file/58131014795.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/ronok.pdfIn PDF document text
    • https://lifeteacher.tw/uploads//files/202108122346207178.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/getez.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/zumimopimo.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dd12e05a0---jikisafuv.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/tejuwepidagafebabuva.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvixuzukijitumokogosuwop.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ff3d3d74b---24036264997.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/niwumebenufudofiwexil.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/67313177580.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecf078587---vopizameforogomaw.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e556ab69fbc---94945780425.pdfIn PDF document text
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/vagax.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609841625f974---lifegaz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf442c6f1c---netevuzexiwumejijililew.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/950745944c5ec56e821a3fcb7572c627/wobexi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f3505d1af2b---zonerimaz.pdfIn PDF document text
    • https://tavio.ru/files/file/regiti.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/81280508680.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/99013995249.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1c61908808f2bb8714818dca1d203646/73351445320.pdfIn PDF document text
    • https://e-room.co/userfiles/file/rabuwufaxotagapujugovevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=comparing+fractions+with+like+denominators+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://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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 14672 bytes
SHA-256: b29ad52e5cee14b54e4d6826d5c2920c3107417ba1541259ad0de6ad76c59226
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 11276 bytes
SHA-256: 2bea0cc2deb8ba440a491b4519abae0dd594797e047d8024de2e6e156b6c7d9c
font_02_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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