Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b9aca77b94ef2a…

MALICIOUS

PDF

105.0 KB Created: 2021-09-01 19:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53daa2f0d84a543720f64249d7096d78 SHA-1: 2f959ae0cc437e6dc6e32f3d0f866ca47b3f9f4e SHA-256: 63b9aca77b94ef2a97f4c4de32acb332e84e87703c4b9a0adb57d20d4e5058a1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised websites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host numerous links. The presence of multiple URLs hosted on various domains, many of which are associated with compromised CMS uploads, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://boeschfamilytravels.com/clients/43210/File/52849906488.pdf In PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/eacbf948bf4aba9e1b9ca445ab4dbf27/75697320432.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6277a6ca70---dujeretaribufa.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/sitimoki.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801238ca2ef---38658476599.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/37243531016.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gia6g8r4babihu02p2eg03ir90/buwesinanozuruvibux.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5a82dae87f802fdaf2bad9aa672ce17b/podokiwitabot.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/palajilotabotaxow.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/risezizipibifuxuvef.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/240714204979.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/zeruxekulusoxadu.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/71444586965.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/fijezegijojalos.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/33764403708.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6ff99f20---wovapeguvajopumemisepajo.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9195e37c6---32288766517.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082787030f93---lipazaroxobidob.pdfIn PDF document text
    • http://airsoft1.ro/files/file/92440152311.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/b712319535a6d8351eee9ee66e2980ca/98196643261.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc9be2c10---30362138595.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cf62f15ccbd206bd20b1509300481402/28164551018.pdfIn PDF document text
    • http://amdind.com/userfiles/file/49526225898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=j+type+thermocouple+is+made+of+the+following+metalsPDF 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_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000146dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DC 19952 bytes
SHA-256: 3305e11995fdcd4945a9368db881d6f554c48c663c15a26f1e08b6978bfd1fff
font_02_sfnt_off00017b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B4A 11360 bytes
SHA-256: 50acf511a2099dc8c2a5ed5cb003ce6ff2ebcf2106bb20d17225a2775acd7423

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