Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d9f092f9de9dd3…

MALICIOUS

PDF

103.1 KB Created: 2021-07-13 09:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c4a0bc2a6e942ca8a251b2c52b25ed93 SHA-1: 37d8ee76df665013c804f8aff8a131a97cae80d5 SHA-256: 40d9f092f9de9dd3ba71134e39285077f95cc4b1c588a967739c091dc9820885
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/nukubewinegugerupit.pdf In PDF document text
    • http://teckim.it/themes/userfiles//files/zogigirijivata.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd097326f---58151502104.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7969cb3b03---71613724675.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/kebatiw.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/97b3682de4c4e98c5d761d20d02c56d3/piropoluxituvowukuv.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/88b740d10742e780187be81eb950f833/midepelojuwuxobalujef.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/64277795942.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22ad39fcce---kiruxif.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/6ab26cbho8gjj6or9lug1hlhoj/ratusosoxuruxukuz.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/ripekumukanena.pdfIn PDF document text
    • http://93564497.com/userfiles/5534701285.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc29d2f98b---bixagozalatujo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073486989e62---ginoxumeri.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/milojewezapozawe.pdfIn PDF document text
    • https://coluer.ir/documents/file/pidafopikejoduveramutop.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083278a208ef---12430129477.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a331e28bcec---lakafa.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e323ba662---gumebilojo.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e74e72732b---bakopu.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/jobolebobodowopadidu.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce5762288---49170653346.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/dalaboromejefe.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/mumerixuxufenilid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=old+nation+boss+tweedPDF 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_off00013347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13347 16984 bytes
SHA-256: d8d93673c60e2d3308719fa90dd9e612a7e8008621c86c92706e16f470f2eb8c
font_01_sfnt_off00015f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F78 10392 bytes
SHA-256: ef217c3afdc98e26989456bf390a1d3408eedff548c6bff0b2ea0900e87ee2d2
font_02_sfnt_off0001772c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1772C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1