Malicious PDF — malware analysis report

Static analysis result for SHA-256 347cdf258a429708…

MALICIOUS

PDF

91.5 KB Created: 2021-09-01 02:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c2001168690cd862b57f9f590e7eddb4 SHA-1: 07bd61ca9917bf5caf2fa8eaa407a8bb046abafe SHA-256: 347cdf258a429708553596d94b223b70e8c0732be29d26920f3b629deaa82616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bizbecho.com/pa/trainstation/uploads/image/file/57169345326.pdf In PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/150234115654.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/lubuzetifufu.pdfIn PDF document text
    • http://coevent.ru/upload/files/vesanixofubi.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6a20e7bf39d935b6161e85f007a0a9f0/vutokaliretexepumuguzul.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/85645075730.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/nepefeku.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/54e9a682ffda4d7fa71762cbdb000a03/58901576403.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/25654084736.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/33764401747.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/dinumuko.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/18294900928.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/778117e7b2f399d9b4d2f04e87678aa9/29641298064.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/bae65hri86ro8hrkremup6e4cb/46837224037.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/walodibifux.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6befdb4c5d09924ac183dc840b1b245f/jexono.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/goguzegaxejerazo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gakafirik.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea06d5870---1753843791.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/vekitin.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4a39ed95917a6b45edc5b122bd570bb8/pekimutemusagedewigopi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tafumivifipazagafilogup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=success+in+your+lifePDF 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_off0000fff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10360 bytes
SHA-256: b50b4562bfaa109a99ebf137ed9b2ef7418994da5b928fbb73a5da874ea4bf79
font_01_sfnt_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 18484 bytes
SHA-256: 407050e323316516e8262c7474e1b5b16e39f4ed510965ef615d839a5f2eb49e
font_02_sfnt_off000147e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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