Malicious PDF — malware analysis report

Static analysis result for SHA-256 5925daf65e83e3df…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 10:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb629be7163a49089a648f6f85bba112 SHA-1: a6a4ff8993477a86b369f7c7f5f5cd29b2cabc83 SHA-256: 5925daf65e83e3dfc38fd73663bc2793f167c2e73112a7fcc893d68afae44603
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=android+webview+loading+progress+dialog PDF link annotation
    • http://kowel.com/ckfinder/userfiles/files/1631062853.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/fujufipib.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613af85388492---jododezu.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/60516025125.pdfIn PDF document text
    • http://bronia.org/userfiles/file/88168798193.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/51126022235.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca3a3eccd---50661729086.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/sukaxufafufavu.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/53471910370.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e4420818---turatinizabifegax.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/96729221306.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/gutazik.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/36017317211.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/41990977560.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/38465014275.pdfIn PDF document text
    • https://italvaping.com/file/88573684243.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/84097591880.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/77180234361.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/95147940761.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/91985901204.pdfIn PDF document text
    • http://montesantangelo.it/files/files/82555556314.pdfIn PDF document text
    • http://cochemical.com/upload/files/97757561617.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/49539887189.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 10740 bytes
SHA-256: 63809c3fddd9166ab0c0d5f8f59a36344316da9417a67403f41151dea67f1f0b
font_02_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 18032 bytes
SHA-256: c39c738ae1c4721fe222cfe023512daf994f69f60ce551e3ea3f86480c7912ff