Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e0fe79edfb4ab4…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 13:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c79bf3c7e1c15b881d212f5143384ae SHA-1: c96e03f4db0b6b5ed4e7d0c4f369505f23af525f SHA-256: 66e0fe79edfb4ab4b7a192e3a520010428035c16acd60c96405edfd69e4b3a9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://pixomot.ru/uplcv?utm_term=cell+phone+pattern+lock+remove PDF link annotation
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/purotigexoxasetitaworifa.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14cb54d02ff826523f4174e373673b58/bosil.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/56853532477.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161404b08808b2---merefomidu.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/71357022046.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/rixigok.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/92143038342.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/putugox.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/lukizesijug.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/redojagedojisumapowabelos.pdfIn PDF document text
    • http://pjteam.hu/uploads/75287135690.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/joximurup.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6a6068daa04504deb8a45e8d78f3eea3/zikelavotibotagox.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/xofemiwojiv.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/96896488929.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614167b8e915a---77719691208.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/37958059150.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/47949935009.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/degoxudegeri.pdfIn PDF document text
    • http://stromzeleny.cz/file/danijo.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/simodoxil.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132efc552588---sobopiwopajusibuzif.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/eomm3lvq3pj094e0cu2dhmmp35/46761463663.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/vonapaluluwidir.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/97125379336.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wabivuwesolu.pdfIn PDF document text
    • 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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 18924 bytes
SHA-256: 66fc27347fa66be29f1e489a8e74ad0730d3ccf99913fed66051c7da2ebef2d1
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10568 bytes
SHA-256: c0f621e8d630e84476a433e1c29063304198a74e4c5a1e83ff28cfb668132e07
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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