Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b27580eb6d4dbca…

MALICIOUS

PDF

98.3 KB Created: 2021-08-12 16:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9f6fb163024edeadb9b0018a77790dd SHA-1: 09dc45671f07b2e3d55187f00f6b37e0cd30c1d9 SHA-256: 8b27580eb6d4dbca0cc9ee1dd36ed11e5341393fec123476bb4f4065df31e488
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the Formcraft plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis confirm a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2940eb5ae---6366437766.pdf In PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8f481e70---japoxobudefamebixobuvom.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/42478829183.pdfIn PDF document text
    • https://rajaunited.com/contents//files/11145144825.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/81626796238.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908823e0159---dogezapi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/doaeapml7ctrlj4umepv4vjoi6/tomedamirur.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/jepexiguxuzofoked.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/mudabare.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/0b8a9e8b0c0909459a866fec048f8d46/pupobetaneteruridudobub.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/mizejomavuseramagelive.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/10734140299.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/nelajuwixabexukoliriwesuw.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/fexebokoribatozowutil.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/lejefexudozobowe.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/41832220888.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/nametanizotaleketukuxus.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/99060254650.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dgif1jmkkge848esr5tm845hl6/96113803985.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/sugawiniravow.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/72451280401.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b79cbaa61127979aa0b9489a47662872/falawuwunufovexalunobovit.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/gelubipavega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+does+an+upside+down+triangle+symbolizePDF 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_off000117b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B6 11332 bytes
SHA-256: f5dda2214be1c6a781f136afb19a3e57cd9df750fe7692df9b6f338c71904819
font_01_sfnt_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 17652 bytes
SHA-256: 8fd7fd9b73f0d3760f3a9fb3548e316a19946e90051fbfafc4b4774b4d9292ac

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