Malicious PDF — malware analysis report

Static analysis result for SHA-256 433d957b912fec18…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 14:34:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfd473067487786937532b9b1769c055 SHA-1: 29bd7b832b6f8ecaa64c64b2055e4aeb0a9670c7 SHA-256: 433d957b912fec18f78920e72688188dc7003ebb042bf5c8ad30b3a35319bc30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to other PDFs hosted on compromised or disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan delivery mechanism. The primary attack pattern involves luring users to click on links within the document, which then lead to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.domaine-de-la-ferme.fr/ckfinder/userfiles/files/87425522360.pdf In PDF document text
    • http://newabel.com/ckfinder/userfiles/files/xorepevilixogigobem.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/44245761389.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/59587788833.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tmt3lk74p8gjge64r895rvo201/10796177879.pdfIn PDF document text
    • https://loyd.rs/images/file/88155822398.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3afba7e20---zitedobakewepuz.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/wixenutelinelalaper.pdfIn PDF document text
    • https://naves.cz/res/file/zurela.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/73046961474.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/4330856828.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ee2ce87f---vezuzevosedi.pdfIn PDF document text
    • http://shesob.com/file/files/38844791543.pdfIn PDF document text
    • https://latework.cz/soubory/zatekiwekudolefa.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/linaxusapuxoto.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buzexubomisule.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ca642533---tewebosidakosodafamaxiji.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/tududibedo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144590ab012d---88574884806.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/47914600864.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/wagesijodevuv.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/53b7be89d10c7f0eabcd546d80c12af3/lojefujuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=torrentday+invite+2021PDF 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_off0000b4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 15756 bytes
SHA-256: 6f31dde7a7aa96203e0383e6bfc5c367f9ae2045c2ac8e86a90fd07877259cac
font_02_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10464 bytes
SHA-256: 1e1264a6ac61afc27534cd948ec91b6740a94a1f081db65b6c56120665442f2a

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