Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7fdd040d1a7682…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 17:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7eb9d3afb0d167b19d77fdcdb325a1c5 SHA-1: ac58082f1318ba9973f43ea2badc34d27cc3943a SHA-256: 4b7fdd040d1a7682e8f63aed26aba86aeb81710298dcb8c2abea6ac5f97eb3d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://yogaschoolofkerala.com/photos/editor/files/80027388727.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe7c5d6c8---97065012459.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/43369665548.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed671970a6c---8257661065.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/ninedezitenoguwudop.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/ridalepuwog.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/noliko.pdfIn PDF document text
    • http://jaika.in/images/documents/files/79056069361.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/gulojivirexuvefije.pdfIn PDF document text
    • http://dezis.ru/uploads/files/17626497759.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7rfcckcuc8gi7l6o5qqq3kldrr/nerudawulabagijowexasezox.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b1496fe79---falozavumufazewexo.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/43052656792.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c729e8dc57c---navegupogi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074538086975---nubevipovesoxaxowe.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a42026092a1---19215562270.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/kojadomonugelemuvukizelo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/28731748036.pdfIn PDF document text
    • https://tonitomov.com/picture/file/82725319425.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/51129131494.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b6ecdccb---ziluvanuxizoxewufofisumur.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/24704916010.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3t5bql1coqt68v0lvps5k3ag27/zopekaninafewiguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gathering+blue+read+online+book+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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 10980 bytes
SHA-256: 5a5fe02118e6fb1cd32997be92c56107ce90e0716d41f6d6dc78cd83be4ef228
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F8 17860 bytes
SHA-256: 722e961a713ea5bc94b2814b2193c2a0e137908edf0c51480303cdd2942ef359

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