Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ac82d895401da1…

MALICIOUS

PDF

92.9 KB Created: 2021-05-06 21:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b7f3c0e7d1f55623c02a025cf675750 SHA-1: 2a6d63f32c9c13bc1f1ae4b9deb3e7e46ada9dfe SHA-256: 60ac82d895401da155c55475dbfe59aebb3eafccb983e54ea02a69740d3486ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crewmak.ru/uplcv?utm_term=measuring+angles+in+triangles+worksheet+answers
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607608fadbde7---pirosupefevu.pdf
    • http://aceonlinementors.com/userfiles/file/93354998614.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812e7b36944---xejuvavodopebetatoxozewa.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160867acaf0798---pemisukezemufaxinomo.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ebd25102b5a7d18978deb2d2780701a6/28596088928.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160853edfeeb17---35825469032.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d8c79f0e---4846651540.pdf
    • http://accessprecision.com/userfiles/file/xalov.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e1d1fcc6---giweduzivafibuzu.pdf
    • https://xo-sound.ru/userfiles/file/74694908218.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abe4c046b56bc1116d4b7767d731b5c6/vejebaje.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7e6d89e6348db9ae71d1151b67d87806/37032249847.pdf
    • https://akproauto.com/nbloom/fckuploads/file/94372073983.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/9e64618fecfad9ca3896cb03bab85bc9/69958860949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb16.bin
89c65c11b5b2bdccc28d3532fe5e682dfef0690169f39f4d5543ad199d4ee9fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 3080 bytes
font_01_sfnt_off00010611.bin
40a209277de071dfb21270581569bae13671bd920d6ed35c18325a50736b3195
pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 5108 bytes
font_02_sfnt_off00011780.bin
be61b0542d57414698a387a524a35f385b622f32db0c0595f9d50384633f89ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11780 2196 bytes
font_03_sfnt_off00012180.bin
06c067395e6070980a000ef31387449078ca65c9d0e615e2687e37efd979ad9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 13344 bytes
font_04_sfnt_off00014e7c.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7C 16204 bytes