Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b30412cb1766d9b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 23:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c41c76f3ee3c9e6979f4f695d84446dc SHA-1: 5497fdd90d33d82ac03e6dfb16f7c576ff134951 SHA-256: 1b30412cb1766d9bdd445a9734c5b43e513bed23388be5f87d9d548204afa847
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns point to a common tactic of using documents to funnel users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=how+to+add+app+icon+in+android+studio PDF link annotation
    • https://5uempat.com/contents/files/jiramiwisen.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210920095021.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/39226400561359189a8f58.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/notulewiliwiwupudotiz.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/87164583253.pdfIn PDF document text
    • https://km2804.com/ckupload/files/leviludoxuguris.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614dead2e5439---dululelaluwonukube.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/55915344733.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1d0448a4d1ff1d38206d6fd71b6d6dec/41482270094.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b28f2becb99031fc6d16494c47c98a07/povebuteripabadixatonujad.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/rifen.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/nojujopiridisopizazeno.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/72165328055.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c512f9abe1---7373200428.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sanirozofakagifetojige.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/61135457088.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16136eacde79f8---rigofukazenowozolixiv.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/eac35dc630d7da2c813bfc2237d367b0/8157025644.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/poxoz.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/zaxofidufik.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/86129712203.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/93250787505.pdfIn PDF document text
    • http://only-svet.ru/upload/files/83431927172.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/29015193345.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/21221198923.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_off0000b0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 10504 bytes
SHA-256: 25831df8d40cc65ae15208d0a69f2363993561c26b5f14f37941617f0dfce20f
font_02_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 15100 bytes
SHA-256: 997ad5817ed947f48c234d7150723f9a8002d90d7c59ce1cce23c4e5c36e1197

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