Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bdcf5cb44d225a…

MALICIOUS

PDF

114.4 KB Created: 2021-07-05 04:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d74e48cadf4719588579b0dc49e7eae2 SHA-1: ab1f9bf93013dffc7ee2fadccf34bcf01aaa865b SHA-256: 23bdcf5cb44d225aab4677e0ce7c1a39dc3151568ae68f04c77e3cf69a0e9e05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=silent+55+for+sale PDF link annotation
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/3u0fus55t87jnrs0i5m63qn2qp/4335891716.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jgg0af0sv1sfam7b8ioaqqb9us/39344643048.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/tetugunigogazurono.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ccd3837ef---23556812436.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/0fc30d2b487bd1a118fa4c8ae98cd96c/78839438493.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/31767908377.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608011761b9ee---xozotutesuxabonije.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nhfpe3gsumi62mj2v5ujoue1p8/70131287422.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/napofepelavad.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/76158330087.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8bebc7d8---12310711495.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/505u8mmebvg50uacoq4mdqamgh/9049722471.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/fomusatejurabole.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9d83806b---ruzevupojosebiz.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a247581066---91511968972.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1fe972a2bea6429be16480130344bcc9/rixag.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a42fcbf82---pobefetemodolujavo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hvmul8umvvevj5mnuaj81hihc6/97731570567.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/3084876916.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091036f52248---dinuluxib.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/af9b632f4919a6e74f89ecf57d59f09b/22986301740.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160866c43089bd---41049241932.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160868cb89e159---ginorosuxitoveva.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/282a460b0bbf258be2e1e3e9ae606ee7/62574152467.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/nitovemenanig.pdfIn PDF document text
    • https://olterus.com/contents//files/61184555628.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/guxixijerobuzevaxajuvuta.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C4 10416 bytes
SHA-256: c2f2437e0a0139267f0e67ed61b832706267ebc38eabea4e2ca71b0b25efeb8f
font_01_sfnt_off00015b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B78 7692 bytes
SHA-256: 41933e9602da870b39ead08d0fbdda8f24887cc774cfb6776990e181ba8d31c4
font_02_sfnt_off000175d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEB 17488 bytes
SHA-256: 877f149b45fee82d451b03db0a6ce72e509c74b26fc6442c0bcf928a3d8a9dbe