Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc718a35063bfc26…

MALICIOUS

PDF

87.3 KB Created: 2021-08-20 21:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8b3f08e5946b0ee473d68e9da4817a37 SHA-1: e3689f59743e52f69ceaa8024bc76887fd12beeb SHA-256: cc718a35063bfc268feb8873fa8dd304ef187e1df32bf5edbee042b5e49b1171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://infrive.ru/uplcv?utm_term=how+to+make+a+homemade+desalination+plant PDF link annotation
    • http://firewheels.pe/userfiles/file/rowefoxe.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f1fa05ee3---rejodavam.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/mubowajuramigaxipuze.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f0085094d---52917505209.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b1c59f3234---73409105190.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718a6487906---xilodamavudeguxaduzonesiz.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fiwozunokulep.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7rqjnfuja2f931c3jdsqp263ae/dajibefodijuzulek.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/sidipifexazis.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q0c588korvgo8ai70h801efc2r/zumezalapomipawabo.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/62522220564.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/lefarasabifapataxinisi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb8f09132---28527416171.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/30392146442.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210810070858.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/junimevumolutatikotup.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/66803889696.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/54745141775.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/35539731552.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/degeremevufoju.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/dozuzemenilibejevuwe.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/08d2164eea7746b136adde0d7f1316ad/pozuwukopolubatirelozox.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/2641150868.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/63199220010.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/69903583551.pdfIn PDF document text
    • 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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 10724 bytes
SHA-256: 21314c46e61dec85c068bbd77cb7e24c59604c23bb4e31c8e08759f8526b55bf
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 17072 bytes
SHA-256: ba71837d236395a99af9809b37a9cacbb12243258e0ab7a9e8be0be651fee2b6
font_02_sfnt_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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