Malicious PDF — malware analysis report

Static analysis result for SHA-256 8def4c477a562c6c…

MALICIOUS

PDF

96.8 KB Created: 2021-09-06 10:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d2efce9e7a9b7fa43c014c0cb2200d86 SHA-1: b938ef82b4acc3d3e0241e96cb6a1a10008d23c1 SHA-256: 8def4c477a562c6c9bb9906a06775b4122d00294f184535a9d3b89855e898d7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://keralahappyjourney.com/ckfinder/userfiles/files/lisedirarava.pdf In PDF document text
    • https://synodradomski.pl/userfiles/file/gepijogelopomomudidivit.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/luluzirazudizepevoweg.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/10c85096a7ae07d0b048814590a87095/newobarusidepejufu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4678c39854733d765de754ec2b336cca/86329608011.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/58637928110.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jobejizadipagogizoraja.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jovebujazororadafu.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/99247806557.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/g3nlkro4cljuhnqra9cg4rg33t/99521956036.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/goxufebenos.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/71117252703ae36a78c9fa294ed50480/60243766070.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kitilukivaxav.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ca966d2c---tipeduwatetelobugatiz.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/35875751912.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mulizadulil.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/dapavijitugavixal.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/wuluwax.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/f5e4b954013a3740cd2d08ca0d529267/78439772228.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/7gmqjhjge4hb91hiabsf37f770/rezovovigudubisuzaxevuwi.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/77025166673.pdfIn PDF document text
    • http://netflor.pl/upload/File/69397724633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=voynich+manuscript+pdf+completePDF 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_off000108cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CD 22832 bytes
SHA-256: ad8dae6aa8c5fb86f564fa98aba40df68c90a612e37317507bb2222a5a3c5388
font_01_sfnt_off00014449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14449 11068 bytes
SHA-256: e276687ecfeb63ce4f7658bc701aa19bf3fea62d163ea4ad56afd08acb7c4f12
font_02_sfnt_off00015ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1