Malicious PDF — malware analysis report

Static analysis result for SHA-256 2358835efe07c25b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 17:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18cfbcea5822005bbf03568e3a455eab SHA-1: f5af225f8a1ea0e291de3568b2c17ce73ecbeba8 SHA-256: 2358835efe07c25bcf8314b07a66e944ecc6506a06c85e89dccbd235e2588a22
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to potentially compromised WordPress upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it's designed to obscure malicious links rather than convey legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crewmak.ru/uplcv?utm_term=world+no+1+bus+game PDF link annotation
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/3cmgjvhmk3hbl3lh00nn0d1i7q/85247507786.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/rovenutixisurovafine.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/puwed.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210903183316227.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/44059818904.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/68274865121.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/45187897861.pdfIn PDF document text
    • https://csodamalom.hu/files/files/vunatajakilomowapas.pdfIn PDF document text
    • http://health-bridge.in/upload/file/65765070401.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/rilezufafadixomuxutuwemi.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/87676903894.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/6456059525.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/45128712330.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/kugesupetiguxadudef.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/bazodo.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/24280472800.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///33989476857.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/45002257717.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6ebd0619---dixer.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/bifakug.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/vavubaxetigovibide.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/s65oaq9i1g319b6b0pr084utm0/wudat.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/fizekijegato.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa538c55e---87492132689.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/6549738779.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/55303410629.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/13668055839.pdfIn PDF document text
    • 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_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 10688 bytes
SHA-256: b314836ccd5362384b303c2bebb3371e296f025c3a5c132c68fb5e2c824e3679
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 17824 bytes
SHA-256: 640d8809690e320b91d0437305e0aefa28a828af2db1daa12dc6887e665d3f86
font_02_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.