Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65625f9fc2ee456…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 20:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efba48f73f637a75aab5413d4a7a64f3 SHA-1: ecfb716e2be15ba8d560fbfe1d01f76c5fe8d190 SHA-256: b65625f9fc2ee456c0fd55a9be204f2a5fcd20cf4b2945c848a61c1ef29e0944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://crysiq.ru/uplcv?utm_term=major+mayhem+2+mod+apk+download PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dbb2dc789---wutixujipoluwi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161401e20502d9---zudativogabodaj.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/52681586724.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/87876435742.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/rusisomukuxedarinidup.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/366210938.pdfIn PDF document text
    • http://mosjob.ru/images/file/25528990707.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/zular.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/39423277746.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a6101dac2200b84e3477a35eb889f69c/jepul.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/4326955226.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/60855675159.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevalagawugafowisatesal.pdfIn PDF document text
    • http://health-bridge.in/upload/file/zeniresilalaba.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/kidibedilefunesimabinab.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/96631780304.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/52892012939.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/afd2d4808fd415f87df35cb648e85f4c/mudujosajemozataxa.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/gizan.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e5049010---kabiwesakovodepomi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/lofoxonawegaro.pdfIn PDF document text
    • http://wernitznigg.at/files/13881869067.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/57513016403.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/31623431795.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/5991390335.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/76561610057.pdfIn PDF document text
    • 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_off0000e3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 10836 bytes
SHA-256: 7eaedd93f396175fd1e1cbb3438de201216c47a95fb2b2539833699e520340fc
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D7 17196 bytes
SHA-256: 9bc1bf4c3ac18b6f24b4d6663116a7f04c81123fe3d8889f28148204e7d8091d

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