Malicious PDF — malware analysis report

Static analysis result for SHA-256 572a40de29b8ce01…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 05:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15508c329b3b87b3b3d47d9c912d55a4 SHA-1: 61c20139cabb70b32edae1ecbb18fa468271dd74 SHA-256: 572a40de29b8ce016ec5cb3c54a72cff6355683030c5442c8b0ab2ccc7e7b789
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, including those hosted on compromised CMS uploads and potentially disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for further exploitation or credential harvesting.

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 https://inwebjor.ru/uplcv?utm_term=watch+wonder+woman+2020 PDF link annotation
    • http://www.hgbehringer.de/img/files/files/78781479170.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/85393304466.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/78365880383.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137843b1675c---21973928034.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5e9ffa9aa3522b0b339049e4b5c74d14/50972439778.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091521482118.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136b696a73b6---gafomudiwamobipowinub.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/14895131640.pdfIn PDF document text
    • http://csp.hu/editor_up/31451686455.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/zanevezusinikiresujosuso.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/85140382327.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7a9ad126---vunuwol.pdfIn PDF document text
    • http://kodemari.info/data/files/91998683728.pdfIn PDF document text
    • http://shahgrp.com/uploads/40785259133.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/fodofudegexiko.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/1957900228.pdfIn PDF document text
    • http://asustainable.com/global/file/noxogigipapakirefaj.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/23325244858.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xetafunexiwex.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e1374bd5f812e2a1afaa59cb6fe79030/lovusiraz.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c289cc382---gimifekef.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614168fd816b3---20745640644.pdfIn PDF document text
    • 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_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 18984 bytes
SHA-256: 581babe5787a3ebda4334108ad6761e1f12603d3368d974bd1b75c4357320a4e
font_02_sfnt_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 10652 bytes
SHA-256: 9424e527f0ddd97594f8245ab5b2c386db670762620def2ea7c0130b6516517d

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