Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c13c960195fbbf8…

MALICIOUS

PDF

92.9 KB Created: 2021-07-23 04:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ab401853967eab0356be57375665e5d SHA-1: d33c641fe31517f2d645caa27060d3634706b18c SHA-256: 3c13c960195fbbf841171c21f98870811f1e193be2dedf3d39a2cd110a1f021a
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating a focus on exploiting vulnerabilities or delivering malicious content rather than presenting user-facing information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://kovacsoltvaskerites.hu/images/file/47708737325.pdf In PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/69cf27af5e5ea024b9d12fd7bbe43d17/24886098939.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/50935165688.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/33701418821.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cec053261---55936484739.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/33134269864.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ecd0c3df---90145605480.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/galevadapewufizarewubud.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac953491a5---93082089048.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be55197558f---75908800647.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/kofonulebuj.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbce8e4c49---geberali.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c686cb45---46881243700.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/55131068621.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7a2677c7c---dijolugilejezasusimidev.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/kumobuta.pdfIn PDF document text
    • http://alptw.com/images/files/98291505729.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/57619954038.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/1339b8958bc52cab33398a2cdd478aac/77636463931.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b9fb84888---biperuwamakasosof.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85317235737853423fc81f356a5729e3/5129103176.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/mebisez.pdfIn PDF document text
    • https://ancoraeducacion.com/images/64730129786.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a10e020cb---22903440335.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e74f6b8fab---15181505687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+world+is+just+awesomePDF 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_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 10688 bytes
SHA-256: 182de4e54772a0cae711c58f7d0667f4777fbf86a1ac1c0028660270150e8597
font_01_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 16856 bytes
SHA-256: 5d9fc0cc58ae77492083034f13ff427b239e28d2ddbcc343077362b644783d3a

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