Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0421f66980010da…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 10:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 789502aab765230688aab4f3edf9ee3a SHA-1: 84262f6591d9f11a06cb42de35ba43f689a7abca SHA-256: e0421f66980010da2eea6eab4d91b6e9d09e7dba2614915c51d0b6b6d61d564a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to exploit users via malicious links, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/5293315605.pdf In PDF document text
    • http://tortsurprise.ru/upload/redactor/files/kalovekofalup.pdfIn PDF document text
    • https://best-label.com/upload/files/91134854201.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2bfc62264bb94539acf90003158ce233/bowuzedulodezu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/brtrdcpub6ioqln91rfas7rcq4/tidir.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89985408270.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc0a70533---tizowoduk.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/15869337720.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/58762956968.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160797171c58ee---15075264802.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/falkmd7ofp73h3t5ivtndfrbgv/nexawejoritaguxapoju.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d8o0i6p1g0hsho2of4fkb683s0/59902863661.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/puzojamitin.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/99cc6619e70e2b7aa1cce3aee9744779/jokolelezupinemovudus.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/fubokoremesenotumek.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/55029891020.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086553a9905c---13507394060.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/24164252227.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/pejemuzudolazuxu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/katonomudozewezepedozi.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kezukobofip.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160971552baf90---pobegaju.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/26909928387.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/pagowum.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/51603215751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=zodiac+signs+and+their+months+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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 10984 bytes
SHA-256: 03d2841a31289b246a052a859e71ec1e24b584016569268c43157c4276846905
font_01_sfnt_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 17756 bytes
SHA-256: edcd3e5c5b998d393d165737ca86dd59883a020bdfe17c17e0136c80110c5f85