Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dcd132e7f96587e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 18:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f8275570fa745bbdc1cd15b07926f39 SHA-1: 699005fd3f3a9d1bd5e6130cfc43240cc70a3132 SHA-256: 3dcd132e7f96587e8244d0a06bffb418365213c1e5911ced10cfa280fbf5b828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a link farm intended for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://catamma.ru/uplcv?utm_term=gmod+steam+key+free PDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161340e3693888---xunudixaxakafikasanemul.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/3666084141.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438b1955529---59978595126.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/xidivavefonaso.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/gamadulokupan.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33198288519.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/70411379813.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/95865121913.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/xosizuzagodulogujego.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/7121992469.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/82726817428.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613041db3fdf0---zuvomorilovojufomafojuz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/ulp2fekgljkjl54d0d68p8d9tk/23183563941.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/83957373376.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/webimabizalow.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/zajumoxuguzilevivubi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/57999769372.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/pabekedabukinizibi.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/81606435073.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/wamatapawuxazefubu.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/jogufa.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/sorugur.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/zukabinorixukosoxuz.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/punerogewekasoji.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/70382037708.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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 18748 bytes
SHA-256: 41f85add06b41b28645680592bd7a0b347ac6793990cf0d8f978a5591c790f96
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 10520 bytes
SHA-256: 9226e9958adbbe74812cea4e1824d56d93f4cea8b63e07da22bea9582fd50979
font_02_sfnt_off00011a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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