Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93c7982ae633a7d…

MALICIOUS

PDF

81.2 KB Created: 2021-08-14 20:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7427cc05186daa0a2c205499d8807988 SHA-1: 318483d64c1bc9dde8fde79a90f1cac4e267bcb1 SHA-256: b93c7982ae633a7d895eb2d988f930528df85ee2291337baca4def67c743c945
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://zpb-maciejewski.pl/upload/fck/file/60216339470.pdf In PDF document text
    • http://1careglobal.com/upload/files/nilemus.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/lilopejotebixavexenakat.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/15224006021.pdfIn PDF document text
    • http://usmleworkout.com/files/file/21152305781.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a98583364ad---penodosawinevajejomi.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/e5e185f7b6debfe43cbc750ba1c015b8/11994962261.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c934c1a858---papefogagilaripagajikox.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/egemegowudilerabovavugut.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/74kfi851h3c14o81k105e7eh8l/59007431725.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/98836088474.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/boxijidefisofusogofapabuk.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/58354312980.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/18mi7moh1pmampm5ndnjavilp5/bojazar.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/50339819404.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/32216463025.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160815ebe0a98f---gejogojebisegagotak.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/fegiruwebanevomamef.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/vanunezujefeforifagosab.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/39521205873.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4qbn7tvjf81kl76mt6bjl7bt3/wamiked.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c07a1ee9f4---9192079295.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e250849f---maxozedivud.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc01dbce34---rademaseruvumekogiwasut.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6569bc19c---fazutud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+explode+tnt+in+minecraftPDF 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_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 17044 bytes
SHA-256: c823372c674f10e7684d7bcdab6de92da600ec6567dcf9d995ff2142ef47910f
font_01_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 10792 bytes
SHA-256: 7fc915ba3dc79d4b6d42dc33ca7440f3bb850b4df98914e79305103a425fce45