Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63108be7c55626f…

MALICIOUS

PDF

74.4 KB Created: 2021-09-27 16:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a5d492dafcb93be03497fba00d4c61a SHA-1: 0dd1d7123cf053482cc5a24c85341d771f215dc3 SHA-256: f63108be7c55626fe30190a9efb704fe508ffb43ec24ddbf73b84db2e5197893
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=learning+teaching+jim+scrivener+4th+edition+pdf+free+download PDF link annotation
    • https://lostfoundglobal.com/userfiles/file/gedemibuxapukuwoduke.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/mopatami.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/96803508319.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/wovozovenijipalufisu.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/44701380035.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbdc9784ac---baloziv.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/21083203906.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/8940000456.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/tatitimipoluwijepita.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/990a0cc8520bf541ce6a29fdc23bdb73/9175778622.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/tevox.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8ba6876e8---muzigikuwoxumozeboji.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/43643937773.pdfIn PDF document text
    • http://freeorden.com/media/file/74374340931.pdfIn PDF document text
    • https://onecre.com/images/content/files/rugarotekuwijulafozo.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/50093818542.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/54444711737.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da9e2b1f78---serawivofoxaguwexajerob.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/54244393500.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/95205959010.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150de673b196---xapowagej.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/nomuv.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/putimoramonejenoja.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/57759038243.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210906223834616073mu27k283m196.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/7449869333.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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 11384 bytes
SHA-256: 78caa68384e0bb248a1f6ba35730e848e906ee468808d969997957fba3946890
font_01_sfnt_off0000d442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 18052 bytes
SHA-256: fb458f803534b6ec09c0075de35013487c06bed87e97ab59497f1e990f559f2a