Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bcbf3709b4209f…

MALICIOUS

PDF

92.9 KB Created: 2021-07-03 22:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff984f957b1eb7063da83596810c35c7 SHA-1: bff7a68510935465ab440e7e4d481dd808b25d57 SHA-256: 87bcbf3709b4209fbae680c585c3afb3163f7d35409a6ada831ac68f1ae8ec21
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics flagging them as potentially malicious or pointing to compromised sites. One link directly uses an IP address, and another points to a WordPress upload directory, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/25f7a4017fecfc5041929e61593dcb8f/61634329769.pdf In PDF document text
    • http://paradisoseminatrici.it/userfiles/files/11994285761.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae48f1aba---11130980289.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69761945e---97248672468.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/lobuzalogudele.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/konipezumuwilagunarok.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/wodokofujogolekotosumag.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/66308891163.pdfPDF link annotation
    • http://seventyfirstclassof69.com/clients/60772/File/31730840835.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/26300598255d36c39f6007fefebdac40/vepokiw.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/36320c4js6sqh31hdrf7mef629/35456396500.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0706a65b2---22529763777.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/winofeviresinetejesoru.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/16680299170.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/19aaa8eef436b81fe51976548097f022/25544922061.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/87e827acf8d2f0aee26292ce235b0744/6207703983.pdfIn PDF document text
    • http://brlairport.com/images/file/55793827441.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/88a3a22b9465669706d45639c66980d0/zesodobidatifite.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/17070555135.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/25191218929.pdfIn PDF document text
    • https://koratspring.com/upload/file/77606497883.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46cf995db---57884171601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+answer+interview+question+what+is+your+weaknessPDF 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_off00010675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10675 10756 bytes
SHA-256: 20cc79a96b42d41c288a10c7d7513102f2f19ce4556f050ec340460dfae9f2da
font_01_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 17700 bytes
SHA-256: 170162a3a66cb7e9f2b8c82ff3e7445158c883cd8feefc35c121883e4c4b0a97
font_02_sfnt_off00014dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.