Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2bc57afaf6e127…

MALICIOUS

PDF

78.3 KB Created: 2021-08-05 09:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d77adfa3355ac307c13967bd1c7fc991 SHA-1: 67b9021520ddc4fe240027415efd82a76207a3d1 SHA-256: cc2bc57afaf6e127b65c5ddac5bf0775dee236fb5ebd967bdde1141a3a711b49
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 URIs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://richmore.kr/uploadfile/fckeditor/file/99967921362.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7a0909aba---15484994458.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160df88f130e99---17277087156.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/23691805698.pdfIn PDF document text
    • http://vivaldiroberto.com/img/files/mediafiles/file/51612243671.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/jofogosigebov.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a1c8c2b8f886ab161a9c5279c4735cd9/90785933851.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/2210813b1c548e3461b41b8e1fa46e09/vexikipiwozof.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gekewufadoxos.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/cdd7a8cba8fd2e50e900cf4d0a09ee23/vegavi.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ad10eb5ed3e5121b94fd28ae72aa925f/81658209016.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60cd50195---jozirofobadibijut.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcba8f3d8c---gogivaruxukeram.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/danebuxoteto.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/ximalofuwomamovatozi.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/56699913925.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e6ca8c777---kafubawidezoj.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/52954462419.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bea18a02b6---45889615447.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/gujadarokig.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/hqassmujlgb79cje8bdv8av0st/30639325154.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/5iqn9702d0t1sm4fv8qgjo4ji2/xenozafozipusadedakexad.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7916684b05---26629734283.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/pupebubivaxapapifu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1647be478---63506213645.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07a885915---pugubofipufukibesurew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+program+new+remote+for+liftmasterPDF 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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE864 16176 bytes
SHA-256: 12ecb2f0cb18827ac29ba83e7e44aa5ef6454b63c1974bcb48409ce6044f412d
font_02_sfnt_off00011245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11245 10776 bytes
SHA-256: 2774ba3fe8a8f9c66cac87237a0123164e437af57bcf4ae23add5819e443207d

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