Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a737159bc93dfb…

MALICIOUS

PDF

92.1 KB Created: 2021-07-24 11:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c6a83781f79de280773acf537b3eebe3 SHA-1: 73956b6439b18327a68d79e509dada0e9361fe23 SHA-256: c8a737159bc93dfb4c0ae86ae1101b4e3b3a401e27cfac420fe48977ec5a36b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. These elements suggest the document is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://turagent007.ru/userfiles/file/zupive.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/wodazinosakagimovavope.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8aa86d8f---68832043020.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/kubajevulomuvodafofoduzom.pdfIn PDF document text
    • http://casaalu.com/luutru/files/47021590992.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/xitikuf.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f6jl7v40n1sggpregkuv7kunp4/rapasarujadedoke.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///pokebegeveduzeteraxolaro.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607480db41e6b---mosixaruliwaj.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4de30d68b3e33de06cf5f270edb525d0/15197277082.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/14795485840.pdfIn PDF document text
    • http://jaatkinson.com/userimages/bugiduzawijotixirupurof.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/39244ca8bdee26d77f6ba7c36557927c/nogogolatoji.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/suvox.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07b25477c2---dudiridilin.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/duduzabosupej.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6a91b48e---68799246119.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/85664664616.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/40374685292.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/zozerigufodiga.pdfIn PDF document text
    • https://stopserv.ru/files/file/34848036121.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/4870223191.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082552e378d6---5002836785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=isekai+mahou+wa+okureteru+light+novel+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 10992 bytes
SHA-256: 59b92001141d007503fcfd018e9b581aab09a4846ea442dc5d1da357b68be443
font_01_sfnt_off0001043e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043E 5520 bytes
SHA-256: 7e36cfc16342483f7edd0edff3eed510b7c73805573910c8393de05eaa1b7118
font_02_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 19816 bytes
SHA-256: a100d04a92572391fb24d56715f69ac134807a157697c4793a681ebf0ae5ac74

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