Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc65050eb30a573a…

MALICIOUS

PDF

90.5 KB Created: 2021-06-25 20:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73715ecb640985001c8f10e98b5137c6 SHA-1: 0f54015b01d0206a406fe381e314ebf0483dff82 SHA-256: bc65050eb30a573a75bc1e197ec3335a445883645716612b0ce897b654b9fb84
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to potentially malicious content or further stages of infection through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf06fb707d9---padaxox.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/2dc0c46f6222c31be03ecc8d51193a87/xizepibezakepusuju.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16087269959d10---62044886130.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/23597898854.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/k4ga2a56fc9nd9724nchas4g57/wakefufamugolivabop.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/e35fed4662c4142688bbcbf6caa4d660/41907157025.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58bc9fc8d---fupokifuruwakaje.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16207849203935.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac963ee852c---88774772432.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793cb892578---91678120328.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2697fc0e---mewipigezokabugipeme.pdf
    • http://hcvitamin.com/webroot/img/files/bitivigek.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/d4f519643a22e6d6aebc3e27394cd952/95856737263.pdf
    • https://karinbentum.nl/uploads/file/21324193215.pdf
    • http://51-lq.com/userfiles/file///ponelowesesoterasavu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4a0f69dd3---wiromisejinowejuvur.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eea0d12f4---47865203849.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6ed496c5---zasiri.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3964c20430b0af72bf7a86b2238477c2/purerofimixodesim.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160841436a2b13---xiwaxelimajugegesam.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6f1cfb68---jonukulifo.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/kshgb1phfnnl9mmsrk1arr1etv/35775223388.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a61756d3eb9---nobekomivaxurumuweligeze.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=browser+benchmark+2021
    • 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_off0000ff4c.bin
ddcc76f989624fd656d9357d3adc3be65f66d651ac7bf7b1dd1358fa0ac63daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 17076 bytes
font_01_sfnt_off00012b7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 16792 bytes
font_02_sfnt_off00014395.bin
e1a5624bbd50965ecd14b7a4e3d7197bda53aece3595ace4c7d5f9cf80e1b009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14395 10924 bytes

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