Malicious PDF — malware analysis report

Static analysis result for SHA-256 133a6da1e66f1116…

MALICIOUS

PDF

91.6 KB Created: 2021-07-19 12:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f159e93c23c2e041819bd600010dfad9 SHA-1: 6b9711bb08218d38919a77aeb0357454cdbed112 SHA-256: 133a6da1e66f111686eaa8b210e78aba4e13dbd1ab07460a7351235fb4be729b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://eco-versute.com/app/webroot/ckfinder/userfiles/files/97088391219.pdf
    • http://hotelclinton.it/userfiles/files/sadulafimopuvalifogiki.pdf
    • https://kund-in.com/userfiles/file/luvusugipet.pdf
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/e3d8dbb84d11b7a00e7d1f08a2d81a9c/sozikimemunibigemebu.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3m243leml2dbnj6889ne95h1h1/65386061144.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e71171e12c---sumezalenuz.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/aa120cf9c02c849fb363cdcb618e467a/lilemarotonulisejegivi.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7084e8af18---53974673265.pdf
    • http://ediljolli.com/userfiles/files/silojosoriziloravewa.pdf
    • http://novussiteyonetimi.com/uploads/file/62982252379.pdf
    • http://www.derbysignandgraphics.com/uploads/file/nidaditaposuwowopixokemu.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8e3513726150a801f8b732086386ce7e/55279740306.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607726ef858c4---22560320075.pdf
    • http://igorodstore.ru/files/userfiles/files/veletofirizuragumujulug.pdf
    • https://semsaesp.com/ckfinder/userfiles/files/rited.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608695f617edf---dabujixo.pdf
    • http://biolabsrl.org/userfiles/files/mijazesezebibetimir.pdf
    • http://charivne.info/images/file/firujokugadurum.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076240c96715---sogukuriravofenisepiwakog.pdf
    • http://matchedtubes.de/userfiles/file/kulararimutegexotupovi.pdf
    • http://np-laser.com/upload_fck/file/2021-7-16/20210716084311981886.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8fdfac15d8a6ca0b180dec5007528072/47918418031.pdf
    • https://priscar.com/documents/files/21987272938.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9q6s9v0nit14g7sr1g66cl578v/pivajedigobaxumiwepurunu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=stratified+columnar+epithelial+cells
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 16792 bytes
font_01_sfnt_off00011668.bin
e6a2c1a33adb604b5725cecfa62639e21d10fbe7fdbd7e0386f4ad2ee2794be0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 18448 bytes
font_02_sfnt_off0001460d.bin
b4214827f0fd40771eaeb9e94752f39be08e4f14338380700ade3d811463b9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1460D 11060 bytes