Malicious PDF — malware analysis report

Static analysis result for SHA-256 95edd64394b28689…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 13:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c16997699d01e33fe05a8c02475e172 SHA-1: 801535c2b5a5b94e5b5abb6aff2252846bedd76e SHA-256: 95edd64394b286891e2535a8b0eeff48e5ed9ff61d9764c2b5c699f3100a0065
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The document body is unreadable, but the presence of multiple external links strongly suggests the intent is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9596949624.pdf In PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/8217830503.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/saloxusijirejibirogol.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/gidaxibomewetemixi.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/befemaladeriraj.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/10/file/kuganixinileb.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vs2t5ariepo0iefvan43vs7l5p/73002073481.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/58889185695.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/zegezodab.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gur4if3pnb2sqqdlhkn6v445p3/nibepavexapebutizibi.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210902_19170119C52DADD0.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/36810511741.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/revezesegaduvenemiv.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/sunakukov.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/47578480335.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/13182149038.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/rumezonoti.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/72099077599.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/wevurufidisilejuvase.pdfIn PDF document text
    • http://rentaruedas.com/files/others/38019699110.pdfIn PDF document text
    • https://kratky.eu/files/file/fodalexeto.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613794ebbfc39---nufebutujutilis.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/46029824346.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/bonipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+close+application+on+back+pressed+in+androidPDF 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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 10816 bytes
SHA-256: 82222dcfad420fd824a7ee617f5ac079ca18c7b235d90afec19735ab9f78fa89
font_02_sfnt_off00010831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 17424 bytes
SHA-256: fe48653932ca60f9a3e8d8373bdb0184fd3f3874883fda72ae83653d85ade45f