Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5d796681b284fa…

MALICIOUS

PDF

89.8 KB Created: 2021-07-07 21:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 632634854639c4c8ada017d7236af7bd SHA-1: d883eafc8504bf92edce72e0a097857f058a8566 SHA-256: 5c5d796681b284fa00ae43debfea99122d342d4f78ee763388118aa28d4d1294
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Numerous heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=sonny%27s+blues+summary+and+analysis PDF link annotation
    • http://mjsolankifoundation.com/fck/imagesfile/redofota.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/22pqgqrjg9lrqnvhl9q5bbmbgs/63359213856.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/41939030834.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/kutunadewugivogifuke.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/43115388773.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///14655451852.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/62939340310.pdfIn PDF document text
    • https://anfauglir.com/images/file/38364984903.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8de0d7b2e4---navobitositebizizedawif.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2af0e92b5---84061407553.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/u99cs7petr3ufcp435fd07vof0/vijigugilavegefamakom.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af5f2bc2acc---kagazug.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/85822906921.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/90372251156.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609964d9a5966---vaditesonitemuxe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b83bd7d338d---rivametomupiziranubepe.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af89aea5a---jizomajovuxu.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607935aad74c1---50666867813.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/54536119321.pdfIn PDF document text
    • http://www.dafnimimarlik.com/ckfinder/userfiles/files/75136289874.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c63c1c528f---65684125244.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd4e722fab---niforumotoxipaboxixuwage.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/j4f9p4u1k5v2v10652g6n1ah90/bawer.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10772 bytes
SHA-256: 1f34f8119a3ba03a8328bbc221e0b88fe0436c62ca6d1ebdc54628d85d5432c5
font_01_sfnt_off000115ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 16840 bytes
SHA-256: 182bca66b9ce3be7d713f02f3ee4a4d4fcb29ff9d9c3cd403b6c065de67e3346
font_02_sfnt_off000141e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.