Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8fe1ad9752b3c0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 22:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16f3a7eebc6457b937a2b76e9340dc19 SHA-1: 0d5dfaafa47a1a5e5411b97802bc3073c8841808 SHA-256: ab8fe1ad9752b3c06933b36907dd2792cb2e1ab5b23249a964ae4e5133c4976d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution, by directing users to suspicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nuraski.pl/wsg/userfiles/14094770160.pdf In PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905223509196108.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/zofivofibixukojo.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/34875311018.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406670cdfc8---zaduximovopito.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/vavobexal.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/25366717036.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/26815783234.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/duxiradudaxipexobuvilif.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/86161851910.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e68f87180b---85129047692.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/dofetuzuwim.pdfIn PDF document text
    • http://dothi.info/images/files/zuxasukuporijamun.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6277d8eca---48080804288.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/84769037521.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/821803071.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/remababixajefadapobavabo.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/vofexanejivotetifegija.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/wevudomupubuzogaka.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161407ed13ed96---75103687220.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/vasemakilewonag.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/zisoroweto.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/megiteleg.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/beguzasaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=super+mario+64+rom+androidPDF 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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 10660 bytes
SHA-256: c1cfafe72064bc3e9cea6d153dbc5c19adf42d5e1a899d28da309e37453adbdd
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 17828 bytes
SHA-256: e362833365c4c648b264f5fc17dc0f0b329d6074783b18f2e68c68894a261872
font_02_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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