Malicious PDF — malware analysis report

Static analysis result for SHA-256 f126e30069d42ec3…

MALICIOUS

PDF

72.3 KB Created: 2021-08-16 12:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ee499da37051d13ff45e807232391b2 SHA-1: 6ecc0e3ffeda8d7f8edd513bc6fae7bdf03d0ab4 SHA-256: f126e30069d42ec3de1ac52df8779d170609beed259de0f1dfa575aa2b42b41b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. These secondary PDFs are likely malicious, as indicated by the ClamAV detection and ML classifier flagging this sample as a phishing trojan. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final malicious payload and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7946da26---3783741597.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rmop7jn08i3pueveo5rfchklm0/vekuwakebiviveku.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/12606957979.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/turenifikuvada.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/putasitazunazudesazig.pdfIn PDF document text
    • http://chayka-svg.ru/files/21024259793.pdfIn PDF document text
    • https://mytopics.it/uploads/file/58418883789.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/p8gmm4sqtmht4kqhmpsg9s6dc7/mujubulufobujubal.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nixebigovuxajuriluvenebu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/26747443132.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d6004867e1d55c43b0d3695de92e4b5e/75828861539.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5b4f77a7d17da25b0cb7152ed524ffbe/gojutozalodizaxugi.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/122300288033.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/letuveb.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/mafixebajanotewunitinu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9ca19d9e---49077435600.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/65035259491.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/0cc986fbf37c558a146aae94b13367dc/35935076158.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/703961b3cb51b586ccbe51781294eaeb/roterokudufubulores.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/nubigovejujudor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jeepers+creepers+2+movie+download+in+hindi+480pPDF 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_off0000b56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56B 16676 bytes
SHA-256: 23fc998a6acc743a8ed2ad4685b2316b52588d7827d21e7fc00df99a627717fb
font_01_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 11352 bytes
SHA-256: 9eb23c1622d03a46c0489c904ad7ddbb1827fa70a1e2b35a7ff041ba40edec82
font_02_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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