Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a68485af9fb11b1…

MALICIOUS

PDF

76.8 KB Created: 2021-06-30 19:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d32f9949b528aefd925266c585f181e SHA-1: 0b26848739c558ddb89aa80b1831fb5c6eadccf0 SHA-256: 7a68485af9fb11b13e29134312c693b9ff8038b37ebdc9c87ee86f753a3edc02
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd0d5a3e6---69004042574.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/nikin.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ab82858e5---1759990934.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bhva0os7l2quotu4h8flf5th3/90579480437.pdf
    • http://polkovnik.su/upload/file/xositebejitefipirotune.pdf
    • https://addsfly.com/userfiles/file/bafunulenukawowugomar.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/32274769214.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/17f2cdbeb35e2e97b39350e0df3d1a8f/76116970048.pdf
    • http://curry-box-deluxe.de/userfiles/file/pudurojeta.pdf
    • http://massimobertoarchitetto.com/userfiles/files/26759775693.pdf
    • http://happyhanool.com/ckupload/files/35142741839.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7f8990842bd66b22c2c272957a89ef8d/77260927591.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e56e16714---69765317132.pdf
    • https://strategieb2b.com/userfiles/file/61620542389.pdf
    • https://riolospettacoli.it/filesUploads/file/86910513292.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d1e89f0f477654de8fdad2cc806dd2cf/renebevizavolat.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b53c27585a94e96dea20e1370c1b37c5/mizobugejizabizoxula.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/cui4qqriml780o5iuo2lea477r/jikarefaxidokase.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0fb35935a77ab9a88e89c6e22584d67b/leluge.pdf
    • https://ntct.dz/ckfinder/userfiles/files/wunodipaluki.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f818a1a39---nodera.pdf
    • http://esthebel.de/userfiles/file/fukomobutozagumuxufawil.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/iqijm8k9otgbvdjc23hj86hc4q/divolaxanafavetamosol.pdf
    • http://eszixv.hu/ckfinder/userfiles/files/fumevumurokososideluv.pdf
    • http://otoozevran.com/resimler/files/809492922.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4666e64844---35268553431.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=los+magueyes+mexican+restaurant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 16792 bytes
font_01_sfnt_off0000e101.bin
33d5bd81f3e5660da7ee01c2ba3f34bd9577880011c90a90d308c9a09e35a663
pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 10800 bytes
font_02_sfnt_off0000f9f1.bin
da2137cee7c58a7bad080243337d75540b96e1b8e0166a34359126eb6f0f733f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 16760 bytes