Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e851c386ff47e67…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 23:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c988b871a1b36051c006dd6540491aa SHA-1: 3a0d149a2df24992598a5476d254f32771394566 SHA-256: 2e851c386ff47e6782dcec3b8725c2428774c5bbdc186eb7de3d44c7b4599f38
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://allytemp.ru/uplcv?utm_term=what+is+comprehensive+reusable+tenant+screening+reports PDF link annotation
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611180a6a0419---51255863302.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095467714c09---bujidurovetiragodamizawum.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd155c5c2eb---lolud.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161166485efd77---74634219359.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/dekewiwixaverulix.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/kamurubev.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/476faf80f65aa6bc2ba40a72ad674658/78468670566.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/najasarabad.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/95598471908.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xujetabudalufufuxuli.pdfIn PDF document text
    • https://subarini.ro/mm/file/8959821939.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///98581771489.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160dd95363a2e1---10223967787.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/27992009889.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/77595595962.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/bibemexuku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847091a86c6---vowobamekaretagegup.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/84718031031.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jotar.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/a21441fc4459db4d144ff9068db613c8/8532072312.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3861ccf04db9d2c21e56aee516a2361/51417911432.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cef82604---81218884656.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/92544592034.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a089ffb6---24963190714.pdfIn PDF document text
    • http://samtekelektrik.com/files/gudabigejilodekili.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/rulesaneniwewojagekenajef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 11120 bytes
SHA-256: 16cfdbe8318d053ae3d16f90c7734c8642b0aa65f918db9a6f49813d1c96bcea
font_01_sfnt_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16836 bytes
SHA-256: 453a08f740f7c837e92f77fbb66e987c54bad6824e9eef9a16bd8e93b96921e3

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