Malicious PDF — malware analysis report

Static analysis result for SHA-256 0665b9310510438f…

MALICIOUS

PDF

82.5 KB Created: 2021-06-28 23:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de0c6959f7a15de8bde10c50b999a487 SHA-1: 92e374c9e89cb313cf10e75eef05b657695e99f4 SHA-256: 0665b9310510438f66f7e6dc57b43ecba3d442ef9972d86e5b74043e6ca78781
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=add+email+link+in+pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5f92a879---zamotipanowujivoromoron.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0a7d1a80c3f6a01a8758ffa6609eb35b/wesepivod.pdf
    • https://advantagelic.com/singhania/downloads/file/kanusogofigezogipef.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-12/20210512170406516231.pdf
    • https://nestuby.com/userfiles/file/paranitib.pdf
    • http://canxetaianhduc.com/images/file/wimewuretiwesisa.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd6023c26---lijolitabi.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/aqsprgi64mhb5jle17nori9j1m/47931678164.pdf
    • http://chayka-svg.ru/files/47704242261.pdf
    • http://simonide.org/userfiles/file/nitiridamutobunodo.pdf
    • http://maasmartcity.com/userfiles/file/burizu.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be36d4adda---8485122249.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f85209f92---dopugol.pdf
    • http://agendatourvietnam.com/hinhanh/file/wifipunuxekekopovekokuf.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759abc654e0---xodubuleg.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b8a21cf69---35439220621.pdf
    • http://c2r-auto.com/uploadfiles/file/2021060811190973499.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/2caee19056d70ed2b8fce8e2dea4726b/kosodenufizalu.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8869be738---66334316642.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/380891fr1p7u47mjou357p6l64/80217125475.pdf
    • http://canoeing.by/pics/files/53696811398.pdf
    • http://velocimapper.com//webfiles/file/80002321319.pdf
    • 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_off0000df3e.bin
3b08e870f8412c7d3808e8629959b110f65f68f4739d9da47c02e7881c193ea0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 10244 bytes
font_01_sfnt_off0000f629.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 16792 bytes
font_02_sfnt_off00010e3b.bin
1898853170b8a2759fc95e588050dc3c33f0b00714ab495787cce13083090d08
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3B 17736 bytes