Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae065c4449579bc3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 09:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d0a6ea1aae8bc4997b17fe032b917e3 SHA-1: cf6c0e905991ef00fef9abbff75dcba2da7e7581 SHA-256: ae065c4449579bc3974191e7435ac5082de643f2da7eaebecbda36152b4d681c
176 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to potentially compromised websites. These sites host other PDF files, suggesting a multi-stage attack or phishing campaign. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://villa-margherita.biz/userfiles/files/tevojo.pdf In PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/todonowixukugazo.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/79311044261.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/ribudijadororefujixi.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/97390590848.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/74562130302.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/zuzugutimozajo.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/tufofidited.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ae2e46d1---zugop.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f981790af5---gipebo.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/9802389354.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/92049187611.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/67759938009.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/pinemomipenijizekafaw.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/26971489491.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/79400155625.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/43351143761.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/49157990236.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/17990248763.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210901000010.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/25535291348.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed09692ff---94489187750.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/81273867616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=install+react+native+app+on+androidPDF 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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 18304 bytes
SHA-256: 3d048b112ab9a78a1a84d9aa1e4ad27e24ef59e4f1823135d7970abfe6cdefed
font_02_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 10524 bytes
SHA-256: d3f5ce8899a4db8456d1385bc7a933111ad6336ea834d43cb2efc55660b276bd

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