Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4e484f8279bc99…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 20:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7df6d5ee70604398d4dbe4c54f4d6324 SHA-1: b01721441b047b5459f0e2ecbe8487c379b15e29 SHA-256: 1a4e484f8279bc9972d2303cf7fa69a82f65c86f884d8f236c66b2138e1fa061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=geronimo+stilton+the+phoenix+of+destiny+pdf PDF link annotation
    • http://uptownherndon.com/uploads/files/38951391850.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/gupobamolo.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/93975207095.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/84291036928.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e38aa0e899c973d2407d5e09ded7f2a0/28508370596.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/zoxedovowa.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/jewoxibovenuzuleb.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/tefekinenitude.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/rurasitabetezakupefodip.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/jibub.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/mipekovipi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137dff2958ef---29446872228.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f05bd0dc3e7604bb1c1a7a93019cdf6e/58372823189.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/savojapodoranaradafatifeg.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xivuzejazasatiruxib.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/sukolobamigugonakujuja.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/zawuranijewugi.pdfIn PDF document text
    • http://brlairport.com/images/file/gilonaxifekagevijepekise.pdfIn PDF document text
    • http://halaljones.com/uploads/files/zigarivozupusif.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0a78eec206f7ebb8d8c9a7697b8eeba4/7254377650.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/58730885299.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/zubenilopanoxekowu.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wuzatowutinolekasof.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_off0000c1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C9 10856 bytes
SHA-256: 4cbf417abdf8a42d20288019b184c71d2ff0294a0d7a87eff71bd6650d7dd868
font_01_sfnt_off0000daac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAC 17356 bytes
SHA-256: eb0438bd292b47030d8f7ba0cdf8f03f920749757a6195420a5f4167b5b9b160
font_02_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1