Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43532d82aa9a591…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 12:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9efc5b28940771142f937d6f555e7734 SHA-1: 62498898b2fe482387947644008aed74b490ee2c SHA-256: a43532d82aa9a591d837a2ad677e54568e200d523efbba85a0dfba4697d533d4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, many of which host PDF files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/02b65ec2f707a403233cef0f4e68516e/daxukij.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46a02c9bf---lolodinumusozid.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/81f8eea51ef98ccc2e009f47be02e1c6/80384236392.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/20077672202.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/24017606927.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/69526350015.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rpqbttc3dbisci3hek8g1nkn23/76512834837.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/fajubivakimupagu.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/8f04f54a3bc7641ee9793642331fa7e1/39813682129.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/49787090563.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hd7f170r09kns7dt1iutet3bvu/ziwewiforediguxut.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/347bdc71e363dbf822526f67b503b2a3/36830296743.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611168f9a1340---26594047628.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/wixefanusobizipunukipe.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/vebaxudun.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/74216033204.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/81973555138.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/34596932409.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/62841640674.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d457033e---59531689872.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/sitiwigegaxijaz.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/64b7c8c1202f8d50eaa86646485214de/lomogamovezujasofitotep.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb1a27e78---tiwijilujewaweguguku.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b47a481325050a0856f02192c11f0fc0/gedevazejim.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1trqrg45tu0qhfjbj2ft3kee5i/77892580967.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51912099f---92092488954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+hack+into+msp+accounts+2020PDF 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_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 10872 bytes
SHA-256: e3ccc8103897ebfb7335d98fbe8752af9801c92dc3368fd8c479d32bbe4cd12a
font_02_sfnt_off000126bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BF 17700 bytes
SHA-256: 7133017617dfb1c9bcd30d9379318477ae30fdd987fa9f4cbd2a915b2fa6db0f