Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc862a5e234c69a…

MALICIOUS

PDF

97.5 KB Created: 2021-08-08 15:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1eae061b2ec87daba8d1016b714d2e4 SHA-1: daf0230812f92b50467877455c8799e034c8ae96 SHA-256: 4dc862a5e234c69a69c754f575d26ff0f3960d73f7d655ab7ffe2681adeeae10
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://canadanur.com/resimler/files/topawegufemurizuju.pdf In PDF document text
    • http://ccforum.kr/uploads/file/1625218914.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160915121b9267---2592541567.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608506675aeac---zewuwiwadijosexuz.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/7660440908.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04ecd8210d8b73b8b1d8476a04d0a86a/wosodexoguzep.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8697a8b5c---31481004004.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/82901169044.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/k0gg8qba41rko7ckrufqgjplp2/5168803012.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sgrtord7hrk5ljelhqtn456eml/rukatuxomafipuronapofexa.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/78f295e6345f72d61eac677df80853bd/rasegofitogotuxok.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/4983afd62d645617153fe6103510a625/bowomiwet.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///3054643821.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a871546c3d5---92304710815.pdfIn PDF document text
    • http://alkanboya.com/files/file///zowevegidexifalogazabokig.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/36233162328.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9vvdimg0cia8o5f91tolk3g7j0/piwokafavavilepu.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/34724014181.pdfIn PDF document text
    • http://bscartridge.com/pic/87261467923.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/65219525000.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073521e2edac---7267712888.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/guvesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=medical+fitness+certificate+format+pdf+for+jexpoPDF 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_off00011610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11610 11004 bytes
SHA-256: 73a44672e276546f6c9a8f83615e8a4c0a83c450501b01063c4eee9874af62e0
font_01_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A4 17396 bytes
SHA-256: 72a529e665e0d8503693dbafebef16af4d898739a8bd630b7980ecdc3c6f3659