Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb2508166283c4c…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 08:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e7d8b7d158e730461bddea99f05a4b70 SHA-1: 6ece13f435f792bfbf742e8fffbd8f0ab09dd720 SHA-256: 0bb2508166283c4cee43b8994288772b0fd19237dfc7c6a89f8acd1da8e2d90d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate an attempt to exploit users through indirect redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://accesoriosalmayor.com/images/userfiles/file/57460226562.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16082250c2f38b---panewemolagiditulelemite.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/xagekumi.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/44403844057.pdfIn PDF document text
    • http://deauville.ru/files/file/7188423769.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882c7c3aa22---gobusumelawafibozo.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81a407b8c2---janubogivugisur.pdfIn PDF document text
    • http://martonelektro.hu/files/file/97833416147.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/waxiruxalilosi.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/71304089998.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/nefawikatiwanoranakag.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f253064977---39048764149.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9s0cse9ina6e1a734grcleguc/42180085686.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/82185005324.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/73868265393.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e93c05217294887cf567b84e1ec06ebc/63339833502.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dccb7ff18b61f7127aa9eef685a5e00e/juxaxarinote.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3b242bfaa---82333433977.pdfIn PDF document text
    • https://schmitz.cz/res/file/jamexenewuzesowevelukol.pdfIn PDF document text
    • http://isgsrl.it/images/file/duwukumisiwer.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6cf401ce71570fb7570cc8bae614d105/jumovofirefapabewode.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b667770432---lizoxunoxiv.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/razijekap.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/22011c7312ea8bca2577b25ad08ca843/86747732712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=strongest+hammer+mhwPDF 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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 18280 bytes
SHA-256: f41f8b080754befb02fe65f2a2187a62edf105ccf633c24e28647c5e4e46f790
font_01_sfnt_off000121d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D7 10580 bytes
SHA-256: c81c32c53ad0f8edad7be4cd4553ea80492190512726e4cc645ed58b6f707fd3
font_02_sfnt_off000139de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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