Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c768500b443e2c…

MALICIOUS

PDF

96.6 KB Created: 2021-09-05 14:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6567823693f861fa4ec1080c30217049 SHA-1: 927f0023e767ca6fa5cb624a0a0550871283cd69 SHA-256: 31c768500b443e2c8958edf5afa85ebda7da8bc6b4ae5e5aa0fad59c05ad99dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://yaqeen-eg.com/userfiles/file/89894378596.pdf In PDF document text
    • https://total-sport.pl/img/upload/files/wetapixo.pdfIn PDF document text
    • http://hoachattn.com/image/files/83646020732.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210716203424_271ubn.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/nepakosasisana.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb9077cb8---sopejolukaditin.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/xenevizedikuweniri.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/64335539876.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/59258195999.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/17fb5ddc630b1351d0e1d0140b067765/wusamamutezumu.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/tudimipezolaverar.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d02d78fcb---82520139429.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-3/20210803192707175107.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/97329592355.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e7821fa29ee200343aa8fb0cf4990151/92936256842.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///94526424817.pdfIn PDF document text
    • https://atlantidegattico.it/file/kiliro.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-4/20210604085027302719.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/tetanoxadipazotipovefel.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4f27da8b---4029646699.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/78446356610.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611efb09e0619---zenuwuwubopamezesobesevi.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210730190055_1knb7m.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d236e8c2d4---40729132160.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/48416655571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=english+synonyms+list+a+to+z+pdfPDF link annotation
    • 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_off0001114f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 19024 bytes
SHA-256: 7de6351b01bcb9c08f36cbf4e2d13de3dcda49d45f378480ec145fc147d998e0
font_01_sfnt_off00014359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B70 10872 bytes
SHA-256: f85137a958571f66e09fb5e521784e34052284dd8397576961241926cc2dd825