Malicious PDF — malware analysis report

Static analysis result for SHA-256 a806851aa300c7ac…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 17:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37a0bf35c18697af2e568c4ef71c5ecd SHA-1: b338659c716f5a4b36d8c8d84ed2fce34868e3c8 SHA-256: a806851aa300c7aca76995bbe043804886d7ca6c070174d9dbbf771f51efcb24
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. The heuristics indicate it's designed as a link farm, likely to redirect users to malicious sites for phishing or further exploitation. The presence of embedded JavaScript suggests it may attempt to execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://enotecagaribaldi.it/userfiles/files/82199782724.pdf In PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/d4b12a58795f7089531a5eb23564cf53/10322096578.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/videzanerusadufekuvakir.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/gogadotopiwo.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/nitovefesozolewi.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/8366767766.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/80006450206.pdfIn PDF document text
    • http://nanopena.cz/upload/file/50356680618.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/71618488567.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/13478457055.pdfIn PDF document text
    • http://atomleasing.ru/media/File/jigexezurepuzov.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/59699667854.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/35173974636.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613096c672f50---vuganozipunu.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/durumenosapozogiwodumedo.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/rapofexosiwixose.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/41992156394.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613936fcd5015---golijiwidin.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/1928728408.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/19275925254.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/13478273247.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/sedakujivimetizejawul.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca410a121---20611012061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mcpe+java+edition+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_off0000deb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 17008 bytes
SHA-256: b7b6205fb4a63e962ec3ec02ec0f44532a3d3b0757e53a02b95e97337faec968
font_02_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 10480 bytes
SHA-256: 577a5df29fa8205983b000eb7fe3517147e2b05b0c32ec0bd758b46789a6337c

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