Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1292b82b25e9cf…

MALICIOUS

PDF

279.9 KB Created: 2021-06-25 09:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 260ed7ed699bb15b854bd324a67c53f2 SHA-1: 54774f1d4efe1f72187e8c7f166d093e6902bc69 SHA-256: 8a1292b82b25e9cf676b4e5cba3fec18417835a0f808494889133826939ac49e
126 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 5

  • 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.
  • 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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e5b77577edcc6caa60fe362375958297/53878012940.pdf In PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46e231a34---50177581171.pdfIn PDF document text
    • http://yilip.net/userData/board/file/92548008959.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a527f9b7e0e---kumopuforofodabamavimed.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/panoratavemetiwidoponoxoz.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/2002641722.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cd1a05d21a3b32715f2cf4c33c8ac61b/23965908911.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kenusogiravebejogareboka.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/dasejuxusebawamusav.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077085a362e8---wevujidujifuxezupizesuk.pdfIn PDF document text
    • https://dintek.eu/uploads/file/mufej.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b4b481d7a5f3773631c56c30d2868db6/70157382277.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/pp0g1ftolbbnou7vh59qi5jbob/nimewiroka.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098303130412---73680723700.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/18795786479.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce5a331d56---nesikosibo.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/pgcli8ggl0ni7nav188o2q54h9/juzifirepapokodiwofil.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2ba9723e3e0a27ab0ba1eb861b6ece05/115003227.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/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ielts+reading+neuroaestheticsPDF 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F188 2912 bytes
SHA-256: 1dc4d53cc543180180c31573cc7ff31d5166e80dfe0f7d334e321c19e224dfc4
font_01_sfnt_off0003fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3FBE3 5020 bytes
SHA-256: 1739a860599b922fe5bdddc5a8173d46fa8786a17fb2f5653d4d215393727a86
font_02_sfnt_off00040cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x40CDB 20104 bytes
SHA-256: f2d465a75f30ef1c05919eaecec531e97de4e81b1b74690e8e0f1cd4efe1ff4f
font_03_sfnt_off0004413f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4413F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2