Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e11577f4c381d6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 14:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad72ee27256ab5f02f02357fa18b803e SHA-1: f414ada6c309da5ed76bc5f250dff8d164e7f6b0 SHA-256: 92e11577f4c381d6f642ec9dec7563bbd4497bef8c09e2d1a4593f1d13eea8b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many pointing to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=we+still+steal+the+old+way+watch+online
    • https://classconnbio.com/img-jacson/files/tibif.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f7cb5fb9---jebalegezerelu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h8qp4foh2q2picenulnadd8c2t/vibidigupisupobosewogalav.pdf
    • https://ppntassone.it/dati/upload/file/98932803307.pdf
    • http://radecznica.pl/userfiles/file/nolodekog.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/zozikamevem.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/rexupigava.pdf
    • http://lesbambousbleus.fr/ckeditor/upload/files/wivexetulu.pdf
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/73415516382.pdf
    • https://gemma.lucien-sv.info/uploads/files/6145e4608a2e9.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614162bd5a265---pubibom.pdf
    • https://karlschool.org/uploads/files/202109160103255100.pdf
    • https://penal-garazh.ru/files/getuponefoxozexi.pdf
    • http://tyros-club.de/userfiles/file/29661908307.pdf
    • http://zerosquareonline.com/file/goroluwunakata.pdf
    • http://irk-yoga.ru/upload/files/61281229679.pdf
    • https://mangalargalux.com.br/ckfinder/userfiles/files/vagusixejitet.pdf
    • https://cartolmania.it/file/80200765035.pdf
    • http://www.mab-solutions.fr/upload/file/19340158818.pdf
    • http://biosurfest.com/userfiles/files/jewidalomibufavibi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d626.bin
777a763a51fafe8b7a6a63d0f1a7daf2d3955d5eb67991b518324717115dd6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 10560 bytes
font_01_sfnt_off0000ee42.bin
1f4e0eb0aca52259f07b2d557c385074e7f92e665b933850ad7dac431b42941d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 17844 bytes
font_02_sfnt_off00011c68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C68 16792 bytes

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