Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f993c04a984c15…

MALICIOUS

PDF

84.0 KB Created: 2021-08-16 15:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5ced13947b5ebf57d061a4b46d5ad47 SHA-1: cde4906edafc37f725633dfb8e1fee051b11d9e9 SHA-256: 36f993c04a984c158da568ddd3ac9e0ae4fb09669132bffb81d06c285563ad60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://ticketsperiodico.com/galeria/files/karovami.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610edbe850282---parafaket.pdfIn PDF document text
    • https://webhosting4.net/media/file/badodebugaxerakebezu.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/revefatopiwubijine.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/01d58cd032e89ad2addb6b3efd33f1bb/49780093346.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f6a837648856127877084273c20aac34/puforabivaw.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/n3olmg4pejrsgg53dvc9sqpvij/83763225423.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/7907529440.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/69202746818.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/munatagujetopetenifokeno.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5fd8cee9e99173ac42be7bc4b6a9218d/19160293487.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14ec6ab60d---70762724504.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/794b74b749669da65c3085fd6b46a23c/vonugu.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/47495009795.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/17476219349.pdfIn PDF document text
    • https://isleo.com/i_photos/file/peruxowatowasom.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/jomupavesut.pdfIn PDF document text
    • http://boldogelet.hu/media/tadimajufojelaloluz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/10lvrr4g2j1ho8sknp3eohnlb6/23282018040.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/59316320479.pdfIn PDF document text
    • http://sadex.pl/fck/file/25254066616.pdfIn PDF document text
    • https://congchung7.com/upload/file/24120076837.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0612dd6c9---53296441043.pdfIn PDF document text
    • http://rayanchem.com/d/files/11372638562.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86c9b0f835---46689895413.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da0926738---wupazuxilipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+mc+hacked+clientPDF 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_off0000e657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE657 16692 bytes
SHA-256: adbf71e55d2bca1283f006eea047569cc834888f33df28621339f1f00867e852
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 10560 bytes
SHA-256: 72947d9ce5195d799bfbe372e606fb19e91834a22a9f850a53a93bb169586148

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