Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfcd1d676051013…

MALICIOUS

PDF

86.6 KB Created: 2021-06-08 03:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3702cc7b65cd9d0d49c8560c28f737c SHA-1: 7176aeac68038910eaf0f008bff1fe89bdf4c8bf SHA-256: 3cfcd1d676051013cabf19eb70d8171e4bc852907a74b5e4ccb88189587de602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm indicators points towards an attempt to exploit users via malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/uplcv?utm_term=unblocked+games+6969+1+on+1+tennis
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vo5hpiu8l4pbhefa79s1sjh2j1/61759079708.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/0oe6a0aufnejsel8ln6iebhcn3/3574065809.pdf
    • http://adamlegal.com/userfiles/file/65983536412.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ea0666cb---nagibusezotemafisobevutuf.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/7864161320.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/80dc5e99a9ce69200442372c2d065734/nanidoxa.pdf
    • http://curry-box-deluxe.de/userfiles/file/12147928388.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e863aada3c---58909082516.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6d7307e6---razimesemaxenodegalafet.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a6a7bca7---591779384.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24136ceb1---53603293023.pdf
    • http://greenbrier101.com/userimages/23492001589.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbc36d03c---widusuk.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989a1699c60---gunilexilo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab32290fe---96348130284.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4454eede23---97202724183.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5c.bin
e950c119b1df4ce05bfa6eda5c1fc2a222006bf6fef3d53981a88b0d8a42a30f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 5508 bytes
font_01_sfnt_off000101fd.bin
0db45947113d2f15312cbd635c8d11d7d83f9112c7e18462366fead4af3e3d0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 10888 bytes
font_02_sfnt_off00012692.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 4324 bytes
font_03_sfnt_off00013492.bin
a4304ccd183affc657844c1327b6743d3fdb2a4bc3ec8cf3a11f67590358c43f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 7160 bytes