Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af32dfb689c1a7b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 08:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c01bcf09ad01709dd2604f26692997b8 SHA-1: 6a72cb22b8d3246965d703ab1412697523ed6e3d SHA-256: 9af32dfb689c1a7bff770194bba765578fdfdb535bdd12a708fa0396d1c1c1b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common phishing lure.

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 https://inwebjor.ru/uplcv?utm_term=hack+archery+king PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3b8a12d39---95094233972.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/wavodesojevaluxuror.pdfIn PDF document text
    • http://grotech.in/userfiles/file/13186712442.pdfIn PDF document text
    • http://sial.pl/galeria/file/32563648156.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/wagajerawodezebowowupa.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/zidemexuviruzolakox.pdfIn PDF document text
    • https://network-italia.it/file/pejumenujiriruluxezixeje.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/naberagojasuwitesu.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090508555273499.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457d6e1e838---gevofukezugo.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210915_094816.pdfIn PDF document text
    • http://medica-brno.com/files/71026255211.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/mokezitozawepunoz.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/98871466295.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5ceb1994b0177b5a29e9ed1bf0743c71/59713827689.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/23187594801.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/tikipunonawabas.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/1sfds2j71j4kcm69u9knkgdivivfct2d/24680321104.pdfIn PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/vedojowizutafez.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bb82eadb2---raxirujomezigekama.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/jolozexoruvogesaw.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/49976272516.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/22361136499.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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF302 17516 bytes
SHA-256: c3f13adcbee624faf1a0c3ee61a44454e573eb52abd40e926a431a53388fced6
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10272 bytes
SHA-256: 9a57908b2e27b87ae5cab717a67041e37e11cab255d7d05c6aa5f8b581714f18

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