Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb8e761fc74a0af…

MALICIOUS

PDF

231.2 KB Created: 2021-06-23 09:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 00dac51b3a0125ad5133e1e6cfe2b562 SHA-1: 6d139460bda8615acef78a6b218692b504d24867 SHA-256: 8fb8e761fc74a0af43bcb2d1ac83d77aca8b8068bf3750ce434c9542cb42ebe9
126 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9140

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 http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160973fc9ef67f---15682843594.pdf In PDF document text
    • https://rybczewice.pl/userfiles/file/28138090541.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160867a52e577d---51554341341.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44f196f8f---71359483651.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089adc24727b---32559539014.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/7084194230.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u81c11ic7ttssskto00sgfges6/31152201049.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609324ce2d766---tolowepe.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/xagavezutun.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b75f3ba0808---51660962150.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/26759708090.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/99721297367.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ef2bc3b6f30e18f145ebbf054e6faa0d/82946403715.pdfIn PDF document text
    • https://mszukam.pl/dat//file/6140013428.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160817b3b663c3---zosagewokugidor.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/sexasiwo.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/pivetisifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+spins+coin+master+november+2019PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000304d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304D0 6892 bytes
SHA-256: 3a3dedaba46c2bf69cdcb6ee900e7ca69bded1a15c6cb136893d0145bea4ef87
font_01_sfnt_off00031c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C3B 5472 bytes
SHA-256: 763cce7cd45db6fa1de2f0efbe6bd0788eedd133e8db6590e7c184e79082e746
font_02_sfnt_off00032eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32EB4 21248 bytes
SHA-256: f806308c4432c80c7630b80aaeeb985b084c919049cfdde359e592818f4870e2
font_03_sfnt_off000365dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x365DD 17440 bytes
SHA-256: 748eb63830569442dbedcd42ad48e21b64b506615637faa5315d9dfa6348511f
font_04_sfnt_off00037f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37F0E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34