Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c9dba3566271c3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 10:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3059a2e4a3a107d97aec60a0cef1ddbf SHA-1: 8cf0f124dbbd695d00dcf528ad0fdf5c93de2b13 SHA-256: d7c9dba3566271c3b74ca395fdeafb567a2076e5a903fd7aed7bcfe499d6babb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, indicates a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest potential for JavaScript execution to facilitate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://innova-perila.ru/upload/files/50946828154.pdf In PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/7dd0520ab51cb5e308671cf17bc6cb1b/buwovaferoxokab.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/50389891265.pdfIn PDF document text
    • http://medrea.ru/upload/files/pofoj.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/vakuxadal.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/nogunetogumelosu.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/21600436473.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/4851329420.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/25982608390.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/22075451761.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319ae76d690---detapozutubutuvifabozufax.pdfIn PDF document text
    • https://anakmeong.com/contents/files/46825728087.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pipupazig.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/14570354476.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/sebojesidawixuwab.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/japaparuketederulokutize.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/64115098364.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/88587085638.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zufinu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/14981257436.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/70304930186.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210905203222.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/brmnngldb4n3mjfq9fm374icb6/xezep.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/l11vpicba742nc4aspchmv19c7/zipolixigaxudenajazagure.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/21093136573.pdfIn PDF document text
    • http://poiskvod.ru/images/file/paxujomokunijemer.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/14653708843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ppsspp+download+zip+filePDF 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_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 10440 bytes
SHA-256: eec8ff9478341ef053e2dcf7d1ccd247a3351eefec3de026edaa0752cf13e413
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 16972 bytes
SHA-256: 226b627bf9a769eed70bca105c59f33a23eafe70d09b7610e21b74cd63771566

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