Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0b32e4e3a51416…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 07:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 808309a3e98fd746f09117894d470c0d SHA-1: b02c5daa5180eede2e16dda984ae93c6ceb8e9d1 SHA-256: 9e0b32e4e3a51416ee22e02072c8e8a37ee315361414439fe8a7a8dd8c5abe0f
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to distribute malware or engage in phishing. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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 http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d55573eb7---74824333680.pdf In PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c40677e635e---29613683059.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/agubawarubokubusezap.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/67308138488.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gicn0anp1c558gjn06uh2oo830/90431253305.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/37450037072.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/83899163888.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160acc16c09475---gokanodosuwalebafuvujit.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252bdde5df---muvixog.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/j4cpvvdb2s4hr8k7b4gjrme1rv/xopumizegibosaz.pdfIn PDF document text
    • http://qzgj.cn/upload/file/306549703.pdfIn PDF document text
    • http://vce34.ru/attachments/file/basogejukupupevomilez.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/wovifanekaxugebamujujodu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba800d8fc---favakigedipiwaminij.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812f668c2f8---lemedimasalabo.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/22531526646.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3a4cc48b---wazamibapanidepajosomefaw.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zakodaresukukole.pdfIn PDF document text
    • https://aspirans.com/files/file/46730920805.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/410548a414ff54f32c6165fdfbcd5933/wutoxonuwalefiwul.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92b0d09a29---musowopegaliki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+unlimited+food+in+dragon+cityPDF 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_off0000e4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 10940 bytes
SHA-256: 1549f61688a5479456fd7aedeb046863be49aaf6ae3b2bc8fabeb4e70a3eb99c
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 17680 bytes
SHA-256: 7302eb75a2fbd650e7ffb4631140c7217892b64c9e9d4afad3f354c0bd43d26b

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