Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1b99cbf42dfcef…

MALICIOUS

PDF

86.4 KB Created: 2021-07-03 07:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e4ec9788834c9e61893c47ea641e5cb SHA-1: 62b2dde4236ae9a758d6d1351c2674695bf251bc SHA-256: 0f1b99cbf42dfcef6b3b5d7bfc3870069fb3ff16ea75bd73d24f9341fe33dca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristic firings indicate that the primary goal is to redirect users to malicious external resources.

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 https://oniceh.ru/uplcv?utm_term=another+word+for+innovative
    • https://papiratisk.cz/soubory/kowura.pdf
    • http://chinamakina.com/userfiles/file/80046220942.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/85c2467f97a2c88a4819ce04b04d269b/tivezivovivujosipepugi.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a7bf219557fedf39939843cc0eafb6d5/mozuviviwikagegoko.pdf
    • http://derkwoo.com/upload/editor/files/1062913206.pdf
    • http://vin-baietii.ro/ckfinder/userfiles/files/57866055355.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081c55d62ff9---23612923958.pdf
    • http://bora.su/ckfinder/userfiles/files/fuvuvadazojifo.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5ea0d4182.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ar3117eap7qem53q842im9tlgf/jusowikedawemoro.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35d9beaeb302ad63ba3a79b8706c53a9/xekob.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e0f770c182928ef06ceb74ea301445d1/67339713397.pdf
    • http://traiteur-ribot.fr/userfiles/file/1139036327.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086192f4c1ee---72375951648.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pkgk4sk9jm6arch0c3ik8mn2h5/33308064068.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2544f35d57bc63ea5c8368f7e118cc93/bubaxazopogegimer.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3792c05965ca2fc8e6e1fc326ff39474/vutusuxerotogesi.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/24713856509.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5du015qfnqss45ntt551c8nodo/89951884876.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b106731bfff---90649345741.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bd75ece25---tetojozufanavojege.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607938589bc55---35041356749.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3c7e542c---40272239361.pdf
    • https://ivanamihic.com//files/45428904921.pdf
    • 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_off0000ee9b.bin
50227dc758c60f3df1a6d08ca8c4047e13586e26ff42bb2554d2fbb51b2877df
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 17100 bytes
font_01_sfnt_off00011b24.bin
08899f52aa8daa2034f1533e747cf64e51776292c6c5b74eccbf17ce3b50ebf2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 10368 bytes
font_02_sfnt_off0001329a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 16792 bytes