Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b9b81dd8f69163…

MALICIOUS

PDF

70.8 KB Created: 2021-09-24 22:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd2c0c18ae395a04c39c8748a4503173 SHA-1: e73d2da7ca8ab409e9fb5bccc588a1341683c087 SHA-256: 59b9b81dd8f69163e69715a732e6e87b33b9e39c97efb643c82824cde0904b85
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0tnan02lf7d11gg07tago2fef3/rukolimenaku.pdf In PDF document text
    • http://dreamsurgerycn.com/ckupload/files/zesadopub.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fidanelirifaw.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/leledafukikibuterametegis.pdfIn PDF document text
    • http://vo23.ru/upload/file/83116001540.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/zexodajes.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/bupevisepoxenew.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/1282596804.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nogamaviwenefe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/sb0pvpa95bfrmq27p3coq79ct7/jamonome.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/80800941523.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/beveramewurezijiwukudeg.pdfIn PDF document text
    • http://hotechike.com/files/files/40113942413.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/93667096077.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/fonaviwerumuvosebaxawod.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d04fca90944b661c6d749e13b52aa67a/masizamipaleg.pdfIn PDF document text
    • https://askflip.com/uploads/files/fetezibuzamabonobovez.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/68582283057.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/fupedawamipewuvej.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/53034507108.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/zepijefexiruwesusaxogerib.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/89122901425.pdfIn PDF document text
    • http://gibisch.org/files/files/2867044808.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/pabokaxifuvuvipore.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b19644b8321959b8acf02fe17674e15a/gafosadaxubeniwu.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/13228462945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=duck+life+treasure+hunt+hacked+unblockedPDF 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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 10904 bytes
SHA-256: 863df206df2ac7b305f46f5bb6f94a8e8880cfb44977bc4c08ccf1d9e283be16
font_01_sfnt_off0000cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 16040 bytes
SHA-256: 8dd8dd4b8a2d644974d9e541389516ad89fde5471b51ebc5d7a425bb9e666381