Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d7c8cab3927c35…

MALICIOUS

PDF

87.0 KB Created: 2021-09-06 01:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a7725f0b836c3a4300a42d63a48a3b0 SHA-1: 3fdf40cfcec4e84be49b1bd823d4b8628ae70f8b SHA-256: 07d7c8cab3927c35ddd4d690a4997355ad7a9de8ab4e439e3d78ec4c374e0d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://buyyoutubecomments.com/ci/userfiles/files/xalerej.pdf In PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/48181430653.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5b64a6f4b7d852b501d9da6545e3d653/dasudewakonogupuwo.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-4/20210504103025466731.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mqhkellum7n26ldfq4mivothm5/5197178818.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/86603924735.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/depisinokulibereregu.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/62878937753.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/01927909282198ac602b438975c1f531/69420271929.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98bfa46e46---11251303134.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/ribebetapimiwo.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/toraxedalivurekam.pdfIn PDF document text
    • http://ebus.cn/up_file/file/pividetumagilapok.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6274ed558---dirujijowojamokalobuse.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d2befa9f---67359097098.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6100ba4ca6d4c8b041af79498336f676/87780390860.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f91512c281d6803cb43f4aa177654c2d/gatesunulevijemotopojog.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/pinuwifefiwamusivekop.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/23609209006.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/ranatebopedesegej.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f68b8d8c---lozekuvelosowisu.pdfIn PDF document text
    • http://vaughanreunion.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/dutefukibemava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cyphose+definition+pdfPDF 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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 10432 bytes
SHA-256: 4b00432256b34689e4e13e8006c5f237ea456e16355d832ff59e065d8d3c312f
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 22752 bytes
SHA-256: 8afee36cf30a9088f46adac5c879701a3149889294c5e877c60c58ec566cbf0b

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