Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f926e0061f41e8f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 15:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd313d27e0fe212c44ac081948a069ee SHA-1: 1a0d8c00b8db64ecad2870fa763ecc86aa958077 SHA-256: 9f926e0061f41e8fb4b8a0efdcce539c483e77060f83d8fda18f34f022e269f9
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate the download of further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true malicious destination through a network of seemingly unrelated sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/is0l77rt3rts9ho0ioeuh8eehu/zaxilunub.pdf In PDF document text
    • https://bruceautoservice.com/files/file/xixudetogikis.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/ludatiwif.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210902184626_gnypdx.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/70903882234.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/takezojixodi.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/70937227422.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5b1d12445b00d58c2828bb2b75fda15f/banekuwilulawasaxe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160797b49d47ec---mubenukekumipupakobonaxe.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/wuxunedoxezaniv.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c86315380e6---dugugituredutedupikuv.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608520d7788bc---44576393984.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/48232401110.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/12042033869.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6752325d13---76517705815.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/narovojizafag.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5f684847370787521127038f60eac466/67242902115.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/revowerejebirim.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b93ad52b9a2a7229841ea9500f4f19b9/zutididaxivekejo.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/pumuginafijaxokube.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/rozonebexuje.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089845e48db8---fosarepopumakozewukule.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1dae7976d---dabixegufewotexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=upsc+exam+question+paper+2019+pdfPDF 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_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 11552 bytes
SHA-256: 9e721633e7c7fd0425180cb137dedc211dbb5de495730c6ead4ab2341077e461
font_02_sfnt_off0001114d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114D 18316 bytes
SHA-256: 163945f77789e3588a63a389875bcc3f71fef4d913b7639df455825e13632606

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