Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d69339d5e05a96…

MALICIOUS

PDF

82.7 KB Created: 2021-05-04 14:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe6b8be66b14c52ea59165d20751b51a SHA-1: 1469ade56553a249e3140efc6f6aa765af7583bd SHA-256: 62d69339d5e05a9600fde51876623912de250878720e99f49984d2324ebbcd9e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/f62d996133d99b25cc3d324436a34b15/zujuki.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a7d3dd10---bixele.pdf
    • http://sacoorhealth.pt/site/upload/file/59580574692.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/62004cfdd80f99a1baaf9e9f8cfdfa2a/kasululed.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0ac2fb18fa3b40dc053214bb0509d2f8/mevirunejoropipuvivo.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608698d805ed3---mugetatizolu.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/72cbda162a98a7034558f809da95f2aa/97811231007.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnqrdi0p0q6rf2slk4sq77pfh2/22440711156.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f834496b---zakivefadilijowasi.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef03c376a---73276708848.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12fe7b5a2---34992437123.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/afs2u9lt303jebuul4sk97hiss/salujibetuxuxokanoju.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0b96l2mf2vq0bjc538uhokdbp1/4070717811.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/0fc6d8ef615602d57917795b69f18aee/vupuruxenam.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7d835a0eae3175984318ed4a3940b6a4/39024576535.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7a095220---22050141026.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ddf3939ce---5973779170.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a036050263---paderakabagomujijanawad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=curriculum+vitae+format+latex
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f641.bin
0966f15ace4ab3720861929c0ba4d036dd4a228b6a552a8b6ebca486a8b54489
pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 4776 bytes
font_01_sfnt_off00010691.bin
38ae80799dc68b2cdc655b1915a9c921d31d287058a41155ac0914f913c7f2e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 12172 bytes
font_02_sfnt_off00012fc9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC9 4324 bytes