Malicious PDF — malware analysis report

Static analysis result for SHA-256 6997ac97f331089f…

MALICIOUS

PDF

167.5 KB Created: 2021-07-01 13:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9fe7407b41f62e6ccf240cedeb4514e4 SHA-1: b0201302577ab1ed5907dc8b576371109d2a6ae9 SHA-256: 6997ac97f331089f81d24a29f04f181a9d02288f673229916c316558363f513b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external URLs and compromised hosting points to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8660

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://krisoc.ru/uplcv?utm_term=machista+in+english+meaning PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba63b929523---64032007234.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/fbtfrq9p40q95d6rala9742lis/42274112666.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/vomojupukidulelav.pdfIn PDF document text
    • https://lapiadinafelice.it/file/tazamavadufapuj.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b77e86aaee8---didusebufuvokisarij.pdfIn PDF document text
    • https://senhewood.com/d/files/kufoz.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/27134005978.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094884154c9d---66516876356.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/54413610174.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/52621656350.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/xuxirezusuvidikisijejoz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/250b73151076111ccdbb1c66dfc2a008/95847847693.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bda66d72904---mejoliwipabopusine.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d50ac20347a---zonovudubifule.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uk2mjdlimk9homd9m2su32amd3/2980171301.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098b450ef9d0---jufegusoneloluxi.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/baorjcbv9j076ra3huujdjngs2/64379695613.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/biludapunu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a715b8f28dd---53159794505.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/turopizijubig.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc23d27e8---lazavesekenofu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a863dfbc4a6---subirutogovilagotedaxodi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/dc4ad172561385b1d73fa4e8e5df1dca/91180301409.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/munik.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e3f0d81e2f5eeabefcc4ca4078221a5e/8808074449.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160829b4745089---doraxokalepobareruf.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/qqcpa9l1m0c50k0e3lvvnnosqo/73252410717.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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000233eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x233EB 16932 bytes
SHA-256: 609dfabae0940e5b7598b32c57adefd5d34f5d07ef3d5859def846c277848a4f
font_00_sfnt_off0001f7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00020fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FD8 3112 bytes
SHA-256: b9f4543c1ad5cab61a90a86c800df34d549e5ce585dba422e6607dc0bf4938aa
font_02_sfnt_off00021c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C6C 10452 bytes
SHA-256: f6c5f38476a1c512a38e5f30f41258dbd7e2b277feaed4f542590785f306ffe0
font_04_sfnt_off00024c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C56 26872 bytes
SHA-256: d56bfb976bc0d25e8c4b6d052aab188ca655b77d46b0fdb6317c886ed8545ea4