Malicious PDF — malware analysis report

Static analysis result for SHA-256 5faa94aee1e9d043…

MALICIOUS

PDF

102.9 KB Created: 2021-07-17 18:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 01b23a33dc2295498d13df7915c0cd78 SHA-1: 765a1e598e3fb256c1569663c16589306b2e7a27 SHA-256: 5faa94aee1e9d04388db6fd2556c10d9af7bae124c413d38c7a5741aa4076f1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further PDF documents. The primary attack pattern involves directing users to these malicious links, likely as part of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df48d255f8d---supopasipigo.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc36649eb2---katuvuvunutogunorizod.pdfIn PDF document text
    • http://vodnik48.ru/content/file/78402971260.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4hv11hkgk3si8t14cn4e7gtlj7/70515454832.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3290529af---6776494865.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44d8d89c4a---93651073595.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/58thue6ua9kjlgqb2e9qusfn32/duvufakipazow.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/lepj13qk9pjamimgibituqa7hv/55924712645.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/kezilajuw.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/1572aa92c8b87f44e135228f367e94a4/xebilubiwasuperu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80322ca27---31189857840.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/so5b34etruq1o4hf8rs8vsmvt5/51456723609.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c9d5e9ce---xufujabepaso.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210613_62324C8B0F26B684.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/levebevufanusesefumoja.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/40622818733.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5dgrfuf2ne1jstk3e61085o363/lutuzaxam.pdfIn PDF document text
    • https://signika.pl/Upload/file/guvizo.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/60328531091.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/12187933705.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/wuvisiwijinowowoje.pdfIn PDF document text
    • http://brukbet.com/user_images/file/jixapijuvunarupetukemi.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5e80f1f0---bitimevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=upend+meaning+in+bengaliPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 10396 bytes
SHA-256: 68354ce227beebca4aa957f637a6ae7fb14cd302f3641ec388c588c24ca79247
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 4192 bytes
SHA-256: 58f94b6ec0b2f23aa849b2f0ea0cb8bc2c37b9c461ce7af9df2de2059df21b05
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 17620 bytes
SHA-256: 6ea4c04b384a0f5baf40160d0e5aea3e75be7a81bcd30cde6d02bbdb5df1dce4
font_03_sfnt_off00013cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAB 21488 bytes
SHA-256: 3abd5aa277ea75dadfa88d4e89bb1e78e8cd73e79dec2225674f6aeb5fd64464
font_04_sfnt_off000173ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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