Malicious PDF — malware analysis report

Static analysis result for SHA-256 6836f04c0bf5776a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 00:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c0262a825a42da314d51119f607189c SHA-1: 87927828ca0f8320b02dd959a02ea28f071cf661 SHA-256: 6836f04c0bf5776a9b1b3488015d0cba3b42413450598cea3dac4d2d22f09322
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a compromised WordPress upload storage. The presence of numerous links on disposable hosting suggests an attempt to obscure the true malicious destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://design-klasse.de/ckfinder/userfiles/files/99696141637.pdf In PDF document text
    • http://gruppocaminiti.it/userfiles/files/59437494950.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/34160446512.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/58bd9f6f960d516d2321b06832e69122/5616317308.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/migipibivakiju.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taxerorotu.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910135816.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/wepasuvoxepamusal.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xixozukefilolijilaz.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2d680fe73---zixuvojapezigoluwot.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wijefem.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/384931556.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/88193733298.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/mozep.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/jugoxel.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/nitowipa.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/zamejigikixubam.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/dd2551a6a7c74fe990e470395f20d2c9/milavajuvesogofapikewari.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/gukininadesonododideduxul.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613520b9f39d3---78475487037.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614f8584b723e---mifagebiwanagugiruwuse.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/repor.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/sikusopos.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/24557031907.pdfIn PDF document text
    • http://epicridesnepal.com/files/bodujomovagixagudiwibufoj.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/dadega.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/rodovaxigizabuzokora.pdfIn PDF document text
    • https://jin-ji.com/upload/files/54783864199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=install+android+app+on+windows+11PDF 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_off0000b388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB388 10340 bytes
SHA-256: 240ad8431b7637d3f0d065d025affbef492c3fe749570ea3c0ed1d6c77e92615
font_01_sfnt_off0000cb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 16304 bytes
SHA-256: 91c6c6cc79467624b340639046c2bad8a9f190b66d680173bc81c2ea3d5f28e1

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