Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1439d80f7feba6b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 17:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d82b7858126761fa58c0f13d198cfb63 SHA-1: a10b478232118fd2ec5af0052c17efe8a6244e91 SHA-256: a1439d80f7feba6b559eaeca41f3a8d635a70db3fb411c430b80e9652235cd3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicative of a link farm designed for phishing or malware distribution. The presence of JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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.
  • 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://priscar.com/documents/files/sunefolob.pdf In PDF document text
    • http://insightonafrica.in/userfiles/file/weputaxebapuju.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ce9239f8---27092493163.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/kizosufegadafanijejifufir.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/gizobotuguloxiwa.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/wugux.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/vsh155b7nb7khr6hbhmg2se1gt/5959294597.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609521e3159e5---58223264918.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/6888048859.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/girasavupimi.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/16660071032.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b2c967863---98026899066.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/mejovetimanezumutalezaw.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/99569423445.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/74454373253.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/sibimirofuwi.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/mosukajanav.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/saramos.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/79982357635.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210713233530936594bbdbnk.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501130138380320.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/210829140919020035img4sz8vk3rx.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=matlab+optimization+examples+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_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 18320 bytes
SHA-256: ffe92f92ded8fc83f58f938f80a0bdbdefdb3f4e6d8840fccbe641de7bafa296
font_02_sfnt_off00011699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11699 10856 bytes
SHA-256: c1f42eb5cbef0c40f036db6832b573e106f984eb5b9287561d8acebcd09a4a3b

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