Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4d9af0e03654d3…

MALICIOUS

PDF

85.3 KB Created: 2021-07-05 09:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eade9c334176715e37899b0df9ddd753 SHA-1: c5022c98843c0d28554e9a658ae9fd8c76f8d536 SHA-256: cf4d9af0e03654d31416c3c277e14f483ab4e22db2bf7624235b737cf3e4b988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://allytemp.ru/uplcv?utm_term=from+physical+therapy+abbreviation PDF link annotation
    • http://yoron.net/up/files/jelinuputu.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/81023050546.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/dd38c220019d341311523b04393af28b/moletenipugopa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gft4ho3bm53olij46j9ufl24dn/mogubuna.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/lapozixusojigejis.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/c8cc687f5cdbecad62544018f2caab82/baleforego.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/sekuvumogowuwageneginoses.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ls6g8a55j5l9pqq39tu2e0u2an/zulisuvonetenavumalewu.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/71d80b92ec3356220599a8f26cc45648/wuvikuvaponatofutazib.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/6525383f6528dc7b7bcb054e4d7072a3/75736343544.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/nexex.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f67f75df4---82347361574.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/53130510377.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/98297108625.pdfIn PDF document text
    • http://wawa757.com/uploads/files/5573202185.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4903ca5757---jenegujibiwaturol.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/292383f074cf1a1badcab0cc669ed459/38881138985.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/97095996023.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/kawave.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/01cd54a3583ed6e8b1a4dadde6ae296b/gamixuvesinurujefexulun.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/83ddca6afd5fd9685774fe8791cc9eab/fisalifimajaputubiponoxa.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/13325082782.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/durojarareredegubadabores.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/cd75t8o62vlbhons1lvq34jji6/kixijo.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wiwobaxu.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_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 16924 bytes
SHA-256: 94b4a50f2d7e6a78dc92fab6c32118ad0c5194db980fb173c79b57c02d30309d
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 10936 bytes
SHA-256: c6d928efc0950d9719f0298c175a83a2ff6edf36d0498b97212fff85a210cf73

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