Malicious PDF — malware analysis report

Static analysis result for SHA-256 846068b6a9288a5d…

MALICIOUS

PDF

115.3 KB Created: 2021-09-09 02:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fea84a41bccbe0859d1a8bc86f3e075 SHA-1: 073acbb54b1ae9b33aef001f0e3ed1acb1e4d963 SHA-256: 846068b6a9288a5dc2b6e814c4e84c53bd0925863f584548d57152cb56e9febb
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. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of a Google feedproxy URL further indicates an attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373c9210fad---27270772938.pdf
    • http://kutyasturak.hu/images/files/35888729660.pdf
    • http://newo.ru/files/files/59248561503.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c5d51df1ba55c5e4a57328501fa69358/zibaxodelifejitadulepo.pdf
    • http://hujiangsy.com/upload/files/fawalab.pdf
    • http://dungcubepgiangtrinh.com/webroot/img/files/joxolejakoniropajupi.pdf
    • http://rubivina.com/Images_upload/files/21470520810.pdf
    • http://sun-tes.ru/files/file/mazerebe.pdf
    • http://www.psyforyou.nl/upload/fckeditor/file/jukagasifiteg.pdf
    • https://peisheng.org/uploads/ckfiles/files/612f8642b95ca.pdf
    • http://wintec-samu.hu/uploads/files/37421006609.pdf
    • https://bahceneryaman.net/public/content-images/files/beradazadolu.pdf
    • https://miltonmattox.com/userfiles/file/zotuvefosof.pdf
    • http://didopack.com/files/gulamifirimujesamefil.pdf
    • https://e-uchebnici.com/img/file/gemokabidusewid.pdf
    • http://flyingkirin.com/uploadfiles/file/081853418039.pdf
    • https://aashianarealty.com/file/8819330266.pdf
    • http://usaoxin.com/userfiles/2021-9/file/kodilum.pdf
    • http://domgr11.ru/uploads/files/53520544373.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/padefedeje.pdf
    • http://urdu-hadith.com/survey/userfiles/files/jujofevuxiko.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/05f4d55771785276ac2d86cb6252500a/vojebudaboziv.pdf
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/dowaziwuxiwif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=microsoft+lumia+532+android
    • 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_off00015840.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15840 16792 bytes
font_01_sfnt_off00017057.bin
14903835659839da6218df8bf51f47e596192c253f87a61c014f6e86708f7278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17057 11024 bytes
font_02_sfnt_off00018a0d.bin
d2af6d93c3c59e81180fbd6ecd723e222ec8d80a662ada3cf282e680cd904778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0D 20204 bytes

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