Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43959eead8052b9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 03:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6126e3534f822007a32f6e931b2c403d SHA-1: c294e9f0b83c7a7ef3df83cef1b41ca5c2578f9f SHA-256: d43959eead8052b9ef321efb8c19bab3c75dbcbe7959cc046f33a1c78b689ef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely intent to exploit vulnerabilities or deliver a secondary payload via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/028d6f69770a01140fe04ef1846d8dac/1603801287.pdf In PDF document text
    • http://usmleworkout.com/files/file/bomurelenulewupavuxenas.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/nusepesivatofowaxube.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/dexiret.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/juwiwovedewujadidemofib.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/46612889999.pdfIn PDF document text
    • http://nineslash.com/user_file/file/28770013037.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ec01d3b45aacc9876aa7a0f228fe2d40/varoreximap.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/45080021652.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/vefijefifuz.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/rafupejinirijebivoxujar.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/zidovumaviwolafidasafezu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160aca51302aad---54027961540.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c434961831---riwaseniwalofozuvuwe.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/151200380a904a496d8c3f447349aa80/91903902839.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/82518277449.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/84461663049.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/kogurakuwotez.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/23935087400.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d73a9401700d14382cdfa71952cb7d88/11722165854.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c4de401d---fixisavemi.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/kogabalusi.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/75669472065.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090d82358d2e---xofaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=severe+depression+worksheetsPDF 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_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 16664 bytes
SHA-256: 2bbff50222a3f1d05beaf8f909bc95fbe960e7158d4cce855be7a3bfe8c9a58c
font_01_sfnt_off0000f3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE4 10600 bytes
SHA-256: 44500d93e7c61f0785d03e39d79a0a9ef3f6dd3bc319202e4709eaa7e6e62f5b

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