Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97a7bd588745655…

MALICIOUS

PDF

75.3 KB Created: 2021-09-04 01:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: baed71ca3dea267ca2122921bce56343 SHA-1: 27da01a0b430bf06408b11b83bdd2e781c4460a6 SHA-256: d97a7bd5887456559ee5bf33cde5ef1d32dd5774ff185e6e2f57d5d29f49058e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URLs, many pointing to compromised websites or disposable hosting, suggest a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=pathetique+movement+3+pdf PDF link annotation
    • http://gekon.net/userfiles/file/33329307576.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e1239600f---bonaler.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/notarowisufona.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/28813112639.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63f3897c9---58134601137.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/puwudarefamozajejutudu.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/31198933286.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pedazidefuvoledufaz.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/76700004553.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/50bd3c3c5465263863a00409e1c28ccf/walul.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/nrfalg8p5ajgfuqh42640m53sv/95487232853.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/17974472928.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/lulemugorigo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071eeed2b92d---52880653580.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160941dcf7a392---pilopenirugalom.pdfIn PDF document text
    • https://designclarf.it/file/70546058510.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/10522945612.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/27562608240.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b0cf0fa8b---xupomofaxakexivura.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/t51ct8njlnvanfi7g3tceni2u1/82828122952.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/29132518842.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a83ba574a---29038161223.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/2672145992.pdfIn PDF document text
    • https://palet-school.com/files/files/86326940788.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_off0000c11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD931 10936 bytes
SHA-256: 626874f8699c09ff7efecfd9f2e90938c54aa898159d6af2f8260ab5ea8c0d77
font_02_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 17380 bytes
SHA-256: 40788797224564d094d87e1887bcc1ade5556d499188b60f1c5979ce61699e09

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