Malicious PDF — malware analysis report

Static analysis result for SHA-256 781358cb06201051…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 07:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 130d86e939ae80c8263156b1384b0d06 SHA-1: 354f761c10eaa11098f4e79b37ecc22afb20aead SHA-256: 781358cb06201051bf59d488cb95a5c7a3436a4f16e36fc27146b222f8d2fe7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://maryamghiasi.com/images/upload/files/xodinon.pdf In PDF document text
    • http://www.gdchgs.com/admin/img/files/98973886377.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091af3964d8a---dizinowukoxuzidubu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d361d355---fowuvekojelopubi.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/63252168738.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/13478977847.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/72947964846.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/32719845395.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/6b303183ee79b291b1820fbf0016f14b/94758202415.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/71293191939.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/45024827579.pdfIn PDF document text
    • http://geose.ru/userfiles/file/16723680330.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/92673544767.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/22184765946.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sd8cjvc8r5jbsl91eik9fbk626/34106694854.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/57734660962.pdfIn PDF document text
    • https://andrejc.si/files/file/pejumeb.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/sekexawinitiragaxuj.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/zowolumotano.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/37df5e96d47b8ae36db2d56f08517de2/59177218036.pdfIn PDF document text
    • https://aneri12.eu/res/file/11899202452.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/dexuf.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/2hvaij38tqaqvnej7k82l4qet0/41918840261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=computer+questions+in+english+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_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 18040 bytes
SHA-256: f2ced5cefd3d50cc418a10f81c888e604455b087d94c6b62f1f497a058894668
font_01_sfnt_off00010a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12293 11060 bytes
SHA-256: 8f6f02a2ae75ca961faf739211a0812f876aa504db20165baa17492383ec6330

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