Malicious PDF — malware analysis report

Static analysis result for SHA-256 13875d37b3e2679d…

MALICIOUS

PDF

301.1 KB Created: 2021-08-12 19:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c03e88fe1e49f640aab096a6eba67e5f SHA-1: 25e0d1ac726e31d5bfb3aae07afce2dd85954597 SHA-256: 13875d37b3e2679d09773b5665f00c572b8d41fdb0ac363269166e111ff0dc80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The presence of external URIs and link farms further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

Heuristics 5

  • 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.
  • 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=tolstoy+insan+ne+ile+ya%C5%9Far+ingilizce PDF link annotation
    • http://contrast.no/ckfinder/userfiles/files/23808700633.pdfIn PDF document text
    • http://agro-partner.com/Image/files/niperubovoxufuxapukivusev.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e89ec2850---11010798700.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a873b8f343---47954585692.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/dotafulufefusimezexegamer.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1d41ac8e---95635101559.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/xiwefuxogiluniguxozode.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83de6873bf---vutapamavutagowutopi.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/kosexuf.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/bafurofanijuzateli.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/qqouunm4ptumh89f4je92fk9dp/lokoloxin.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/11740404761.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d5f323926beaacdadf6dd1185c80cd46/26940399005.pdfIn PDF document text
    • http://learningkey.org/userfiles/87560661226.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747405805c8---jetokitajekupefo.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/22422624752.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/53658486707.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/pufujigutimumibibuxevuxez.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/robofadirosilabidajunu.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/rerasukebesemavatozawo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c32b292394d28b02a826476db4211a5b/54712369210.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/91741722696.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a3f2a091---7091329466.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004252d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4252D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00043d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43D44 10784 bytes
SHA-256: 52dc086de0f40b1f91b0131908728d9bc1eac985ab95b4f405856774160076df
font_02_sfnt_off000455d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x455D9 19156 bytes
SHA-256: 2cc8112ecb228194bef4a3cccd0bc7808dbe52b12dd716e8492df589c853705f
font_03_sfnt_off00047001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47001 20504 bytes
SHA-256: 0751791938f2c248a89e9f3a1f58e139e6479294ca673eb0bf75c821c8caa82f