Malicious PDF — malware analysis report

Static analysis result for SHA-256 4647fe9ae32253d1…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 11:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a6959853048f815dccd31a8ee0e7aaa SHA-1: 02eb6edf88ba15177a8eda02f8c27c0d85bbd4ef SHA-256: 4647fe9ae32253d1ee1a9dcb1a5726e6d66b27a6f34818bde97516ea4e64cbfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/moriwesukowokuxel.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/mil7c8v35kcobr7jqan7ahfqdi/suliginezugekiramofimi.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/suxabewapaxade.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109051702594714.pdfIn PDF document text
    • https://designclarf.it/file/7480825996.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/26507044404.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/56716386613.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/15470359694.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/79488132502.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ba8724d290cc5168bdec9361403a9174/tigodaxasesukuguli.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/tosut.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/041428183849.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/gatedesumite.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355a2a6f2d---99600540898.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/vibupemadazuzijudapomifig.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/22481345101.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/17062251408.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/90373606067.pdfIn PDF document text
    • http://strahyi.ru/images/file/sutakusapazodikifeb.pdfIn PDF document text
    • https://zzwgjx.com/d/files/suvinezumodip.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/zobijoralida.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wiwubiz.pdfIn PDF document text
    • http://prograsifkalip.com/files/41494165472.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109072227042465.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302947ce543---ludelatatave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=material+design+login+screen+android+codePDF 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_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 17820 bytes
SHA-256: 21e4a63d5058d63474b0abf2c5e27bd17baded0e8092d7b5a27fe8461ad98a31
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10536 bytes
SHA-256: 6291fdf1858a2e5c43b2f9ecfca2e710ba78d329e8172d460a49787667982490

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