Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bd53de9b0c33f9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-24 23:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ce8a1cdc9e4324d11e86e0d6b7bc714 SHA-1: 6c777f66af9455bb227b81c8498864037e1f6c2b SHA-256: a0bd53de9b0c33f9d9ac0e4b9b17cd65f599ec644c99f26fd265ac66e353a502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/2fad2203ada83dc608e2b3e74d034f85/48450488335.pdf In PDF document text
    • http://ecohort.com/userfiles/files/38991390864.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcbd376568---61569473426.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/69255789656.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/41609185795.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/79767808008.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202109220817346556.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/wamolud.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/83286620526.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/35f95001d8c5f34abd43419e525b6956/15720861264.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/gumivisadawiberujuja.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/73058324694.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/pidebubavepixoromi.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/libogelagafa.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-17/20210917113552273218.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/37215483510.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mozinejasokowawukigo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161469d0f6b30c---7394013787.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109012025295082.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdd8d0c009---37762102902.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nezarozejenurewupenoraso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394b3253dc---fegig.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/j1q2lmhh2sf01n4igb75gv9jvr/42040607241.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/61131064800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+get+free+gems+in+episode+gamePDF 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_off0000bf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF45 10872 bytes
SHA-256: 73a71d8ad169f1a630929282a36085437dd5684a8e782530b0420ecaa9b550b7
font_01_sfnt_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 18892 bytes
SHA-256: 08f55d9eef58c3b729edfbbb4d9a28686da6daad93a09bc78379329d5e1e00ef
font_02_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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