Malicious PDF — malware analysis report

Static analysis result for SHA-256 462fab063c392cc2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 21:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ad2fedadcbcef6bd666e44fdde3c8d03 SHA-1: d3d8e45fda72e3e0250edf789048dce0a4c2c996 SHA-256: 462fab063c392cc299e7ad28de5f6785736db4129b2a051af1339bfb23d83da9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL analysis strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/236bf63367b91cb727412942a3d11b33/98734089809.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9d410f640---59208995079.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/12446771907.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467107ebd79---98679342727.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/zupubib.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/wirizitijoxijimekobu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wururedexomibanija.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/30377072217.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/makukinubigunubolixad.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/tabojexejuzoxebojofigoka.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/6s4d05bt66p9g9r8a84n4psnrb/32793188689.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909083247134097.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/62773718482.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/283240660.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/79778788561401394bccb4.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/puzalojiga.pdfIn PDF document text
    • https://botroul.be/uploads/64265648263.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/dejitaxivikaze.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/wopates.pdfIn PDF document text
    • http://infoguard.ru/content/file/37461941098.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/jurezop.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/3432773546.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/78356402933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=friv+robot+give+up+2PDF 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_off0000c42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42A 17328 bytes
SHA-256: 808b67e8769acdc05c136e1989500810ab612c2519d9b63bd23bda0c39bf52d5
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10352 bytes
SHA-256: 5b8b3f473d80280d67e6d7d18c0b54fd737688f9c6c85f460289ac27a3d1fd0a

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