Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc963c31269b31f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 05:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9bfdb91cf8a5a7fd418d2c7b36a092ef SHA-1: 72c7a1b1ab922700dad3c4bfc20137bb9c99f045 SHA-256: bbc963c31269b31f2c2d2dd1592c16362c3a4cb5db4ef4c3c046867f14c226e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities, contributing to the overall malicious intent of distributing or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://queure.ru/uplcv?utm_term=tai+chi+hero+2013+full+movie+free+download PDF link annotation
    • http://gro-felix.si/uploads/40590041812.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/gunaxix.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/kozogabevoga.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/78927773870.pdfIn PDF document text
    • http://mylead-journey.mandiricareer.net/contents/files/zunujobikowawakogepozaw.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613478376b723---25711772299.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/nodusutelubumorafaku.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/188618679.pdfIn PDF document text
    • http://precisao.org/files/files/9838650872.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/nevenajutuvenisubap.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/bokikamazagu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e8b8528c---ligeluvipoludikug.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vozigevezemoxolanisajot.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/kovutakimufedaj.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/49797886895.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/dogufejipejezuwukaluverus.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/89287016825.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/29403168200.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a752452d60f3bd0326f0e8d6e11e7f6d/12534788355.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2d43eee7---37739038553.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jewugemulutadaterojos.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/burudavid.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/dabusamirigeriwitife.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/70657926762.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210903_9590AD53E8BF33C5.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83734303174.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_off0000b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB589 17072 bytes
SHA-256: 80fc3fb2e6049b9f7730d1279c8a4d9096b313acf5af156dd5c3db1e4c4b5e5e
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 11156 bytes
SHA-256: e53d9e2b6175f19230f870b406733da47c21a796b1438a027338379af0bcad59
font_02_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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