Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1b88580896681b…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 10:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10b96509aa2547aa4a0d22a8cf78ef14 SHA-1: e89929d888cb5707bd51e26f5156d65421f5028d SHA-256: ef1b88580896681b5f6207fddbd244cd6917fd8ff7c9e80a77056b4838fc8440
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a delivery mechanism for malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://artgreen.vn/attachment/files/wakilimolisifite.pdf In PDF document text
    • https://ooo-kenk.ru/userfiles/file/30087432792.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/pujematolemogarawojez.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/85976358410.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xonuxijofitejo.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/97817494615.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/46667328566.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/nijamidobedazefete.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gidenelifoxafagokijaj.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/77313114958.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16141f230ab3cc---77651322448.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/zawesugugoviwumonevadi.pdfIn PDF document text
    • https://soechi.id/userfiles/file/63935671621.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613edcfd2eb6f---zevowemumanefurez.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/19095929320.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/7750073300.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/refepesakum.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/sizetirerekolonum.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614492d322de0---zedatozoxefugepuzokazowe.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136fdc1d59ee---duvatuvibofosin.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/fuvivududakadekukefo.pdfIn PDF document text
    • http://haai.org/upload/file/99019135466.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/46430430366.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/najikoguxuwazogon.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/bopufofeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+chicken+bass+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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 10548 bytes
SHA-256: ea8e24db134bb524b53ab9bc2332a0326cc7a6d966d57f08f0e281f51e78ccf3
font_01_sfnt_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 16168 bytes
SHA-256: e1cb153b2cbb1daa77d77e095c543bb51b79b85faa72aa66a54dcd22b63f9ac7
font_02_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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