Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25e98a9e12e6fbc…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 23:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87dc07b55b21c2ad61389f8efd9af6a6 SHA-1: 5adcd6886107c3140bb7334d26bd43f74982e66d SHA-256: c25e98a9e12e6fbc81be1de038f82efa45891bb45b81ee3d44f310a9e70a2b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on compromised or disposable domains, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://copacndg.com/images/uploads/files/motesemokifot.pdf In PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/61594270133.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/13361984256.pdfIn PDF document text
    • http://vhktn.at/images/content/files/96335001664.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/pokakowid.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/sedarefavulux.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tejabotufovevujozavoj.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/53719326816.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139feb8e6b76---96754961905.pdfIn PDF document text
    • https://tigapilar.com/upload/files/rakivukizaferefilebi.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/numemesugevijijatobeve.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tepozipawox.pdfIn PDF document text
    • http://budka39.ru/files/zedovar.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/rokaniwavanapikajebajot.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9eea67526---wexobot.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/lekupixajebibofobakolapef.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/1181440147.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/edf61b01fa939be45cd46d672e92fdfb/85737430749.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/69251860903.pdfIn PDF document text
    • http://xycrusher.com/d/files/gubojujupedu.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/mubugowapatije.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/62204041403.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/34565319812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=it+chapter+2+download+moviePDF 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_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 10832 bytes
SHA-256: d5074ecde5e771f1c6a24dc1980e99a1d405c2e611a1a14e0c20680713504df8
font_02_sfnt_off00010f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 17692 bytes
SHA-256: f63af3e5612f4439560bac9973e8ecb9e64e15348676ea22b71a751c28fdbb95

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