Malicious PDF — malware analysis report

Static analysis result for SHA-256 881f78550a159941…

MALICIOUS

PDF

89.8 KB Created: 2021-07-27 19:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0c3d5eb3098b679a91afdf3671b87f53 SHA-1: 9082962ebc70d18c3f898932cd4cc379f17573be SHA-256: 881f78550a159941f1846bd53b64fcd8e4f3d68a0ce7778a3f9c8e0c19e2615a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/904f4196681e518cd522dd43e9fc508b/31709538982.pdf In PDF document text
    • http://studiomarazzi.eu/userfiles/files/70087620652.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/vezuxesesabalim.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/97284964810.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/69629625546.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160868e069e83e---15258098536.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/6860710221.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa82a699412---18110497810.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hrqgal8src1qch92tstthb51p4/33355090587.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d28bef0c8---21564829361.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/37229367287.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/64515201488.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609655280d1dd---bifosekesujififapi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/afda1f86fe599b4ce1f3b23ef0f1b965/81000012816.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/48913948696.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/bitojadabiri.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/16179167230.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/golumomoluviditoxe.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d190daacec---kavokofa.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/mawofikerozobok.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758043c4e8a---samefazofewize.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc0360a2e---sejusirigewi.pdfIn PDF document text
    • http://live-net.it/file/77153598182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=5th+grade+staar+math+practice+pdfPDF 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_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10836 bytes
SHA-256: fd0063f82a552aadb7710ca1dcd694850478e9743a5361371f3a5463d6c1402a
font_01_sfnt_off00011435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 17048 bytes
SHA-256: 234d66d41aa88d60fc64ae03d4dd1c807055d1a03abcadada8fcefe387bd1878

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