Malicious PDF — malware analysis report

Static analysis result for SHA-256 7516fc5246eef298…

MALICIOUS

PDF

204.1 KB Created: 2021-10-24 22:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e54325079607ef2ad6d89ced96dc94ad SHA-1: 38961ad4309bae3867aaf08c159d83f64a894a25 SHA-256: 7516fc5246eef298da23877e36b9fb01c202e58cdf8dcc3ff4f078b0e6a7cba3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic indicating a link farm pointing to compromised WordPress upload storage. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • 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.
  • 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://path.mn/userfiles/files/82318184685.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c4519d9ea850c5c80de4e3fc2c64e3ba/27575935932.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/52889953144.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/36147569924.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/91939965278.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/barulobajapitowuj.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/51444508729.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/86236323407.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/61724328040.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/82710234398.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16173890390e70---lalujutogijudukufe.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/xasiwivuvo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bd89e401e9992b345a565042840defa7/88702681679.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486a82576bf---15126580626.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/xepaguwofuluritafog.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/zutekirogewosemivuvu.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/76361433908.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/92851733415.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/54296694725.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1616030eed447c---jojelapumeri.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/6740884899.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/vexerufunuxeserakiwek.pdfIn PDF document text
    • http://enewind.com/pliki/file/mivasevuvajadori.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/26671041148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/5bhJmFgkeCE/uplcv?utm_term=romeo+and+juliet+act+1+quiz+answer+keyPDF 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_off0002bce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BCE8 19452 bytes
SHA-256: 5bf6101101dc1460b78841d6f96d50778c10cb2d7969b57ebb4249e75f753d32
font_01_sfnt_off0002ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF32 11356 bytes
SHA-256: 9a0a40d80ae9c1ce28b7697a808fb291b08b5b7203d423e540bbdeed3bb18ed6
font_02_sfnt_off000309d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1