Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf11d4a1eae507b8…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 14:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7005ca1c31bb0a8dcf41e85c6a51ee56 SHA-1: c037242a27f09b814350eef181a321907fe11c7b SHA-256: bf11d4a1eae507b8a25b46611c480755bcb3ffd049209acdb3075a28b22c8b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://france-ex.com/images/blog/file/43183675370.pdf In PDF document text
    • https://istanajp.net/contents/files/wazenipoto.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/65861005762.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/28392073273.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/6768926624.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/14635673265.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/9877215664.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jopurimowaxeralu.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/25578072140.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zilogorumasibubutetexuke.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e8be7979---mitolufakupiwovuguwako.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/5439254183.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/8eh30djn898ltlu9rauj0sssao/boforozojivodetedatarakez.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/56390669282.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/96b76d5ad8ccff3701745ed9dbb4ffbe/fupufo.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/diwevojejimata.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/11586319892.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/11756667590.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/dexunotim.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/36478261223.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/42118207685.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/wabifapijog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sms+bomber+android+appPDF 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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 18324 bytes
SHA-256: 62a5ae2fd42d47d91d577278cf189165c37a703dd66e89712be0424e15daf3c9
font_01_sfnt_off00011669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11669 10624 bytes
SHA-256: e5d89346c306ab1d245d3897be3ebf2b1976c8b97afc2fc4a145e2c7140b7811
font_02_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1