Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f902bc724ece53…

MALICIOUS

PDF

78.9 KB Created: 2021-09-16 21:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 715f5b47cefa26fc795399d0d8ee9a65 SHA-1: 41a31bbb9c02a20312aec17c795b67d68f652ef3 SHA-256: d7f902bc724ece53221cf0e758cab31ed8d5a90c4b9038054118c2f77a41fcb8
156 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to lure users to download potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dydlhx.com/upfiles/file///gosavimukulub.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3fdc9078---26745812404.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161334c2dc2d28---fexokebelufegototupave.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/36d6dff67e1ccb8af804d3cc17e8a604/modozonuwiludazomajunuze.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f284bbbeb---gefejinotojozelabuneposan.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/katalodese.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/gajonivubepiriruxatizapa.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/gobej.pdfIn PDF document text
    • https://pontus-sd.eu/uploads/file/80203538894.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614015a155d45---35597876824.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/kimupiduwaxuwu.pdfIn PDF document text
    • https://mytopics.it/uploads/file/44559105772.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/44184464793.pdfIn PDF document text
    • http://jn-zhsc.com/upload/peniwiniduku.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/xisubozupugejig.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018e8a3ee9---zerevijenixejusujuwi.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/25925189923.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/56402368061.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/gibesalelejatupubox.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/lawizotosumifusife.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/8760920587.pdfIn PDF document text
    • https://webaprint.be/img/file/40346459095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+download+windows+movie+maker+for+windows+7+32+bitPDF 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_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 11220 bytes
SHA-256: b58f28c544b5799264f01e888a9301b041f78978c4b6032b99cfa3f8a737f6ca
font_02_sfnt_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16600 bytes
SHA-256: 2c8ef491fdc57f5b87bbf923f18ac3b8a3a440f5120bc3f80417c82e921498bc

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