Malicious PDF — malware analysis report

Static analysis result for SHA-256 8407fc724be5de8b…

MALICIOUS

PDF

98.5 KB Created: 2021-06-29 05:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4ec01708dac7b279b8cec6753a0890f4 SHA-1: 60f7c50f6b6e78bfa4c31d1585d3b8ead7cd5810 SHA-256: 8407fc724be5de8b92c5e30b14af6a457ed1193b78268174a35d166977e67217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to various compromised websites. These sites host further PDF files, suggesting a multi-stage redirection or phishing scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/cdd82efa18e16a106662e13f2168e249/ginafopilofibodoxi.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6s7jbbftn7nd0uss8m8k23djl6/sufarafituruta.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/28023508857.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/72efaf3961f11bbbddf3f2d1f3b90659/60466000329.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5315fh2g50t7hj144i1rm3m6sk/negadejikuwetixezi.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/262142476715.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/79260092510.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qm06abkdukpmv8gh2qk667v456/budotufasibojupiv.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/52931489496.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607562518dbbe---kezoworew.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/80a5fd04f0d2c6d5d4febee7a409ca19/69640352590.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21bb13321d---fosugope.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/97533479646.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/55679022341.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/resipotorojiropesudefov.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c550d066434---jevatojedoti.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/65714902408.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a483f15154---zonibikasilitirekuravus.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd6872db3---kikafowekiwoxebe.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/boxudefelalo.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/3130250157.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/wukirewujeseveb.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b9d3268c3cef0ecd67433ae29ec58c1a/29691655779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=technology+in+action+pdf+downloadPDF 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://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_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 10796 bytes
SHA-256: a2b26394a8df53589c9cbbaf2a17c4c8c2bfdb3a382990adba8f27a92fe0b5e1
font_01_sfnt_off00013acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DF 17548 bytes
SHA-256: d6857012dbad739e6f99596cf6df03df63993ad9b23803d1a0d16b18fa4cfd15