Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27abb49541c119a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 12:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db53bb219ca5d5c781c118fe0b3275f8 SHA-1: 30126be32e9ff1ea40d15f540baa33986aa14ce8 SHA-256: d27abb49541c119ab4bc7bf0637db23be0eca0fee2c381288197eb2b0ef210c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://madspot.dk/ckfinder/userfiles/files/46752051259.pdf In PDF document text
    • http://bawaconstructions.com/editorData/file/gonujonaduwe.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/mixonakijofoluzoxu.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/vurikiv.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/84fd18e71351f9ff74a78375696cc3bb/jumogusodofudabot.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5dfee09b3---25404790466.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/89600076789.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/sawixasamilinuviguji.pdfIn PDF document text
    • http://proxima-online.it/public/file/48376542208.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/9878452713.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3df71d83---53088446710.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/a7111598b37847ad53fcf99553e40748/nufalov.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160846d38cfb7c---munameno.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/pejileferilusobutanomime.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/56621461907.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f0947fb4---vemurifomuposasitufej.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e630f3706b5---54609389363.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fesolizilufone.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/41754350041.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/muwakewojunasotagosuja.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/latuxalo.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a5d5f9c1f8d8804a53c46b2803709df3/57474589264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=simplification+test+for+bank+examPDF 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_off0000becc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECC 11048 bytes
SHA-256: be69a80824d93ca3f2f7fe7f2d9211df6db1bd02a767d076f77aa8769601c37e
font_01_sfnt_off0000d84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 16336 bytes
SHA-256: e0efbe11bf3432e48a9bcca5880b7a1907f91e0c551aa209d12f96173b2712a7

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