Malicious PDF — malware analysis report

Static analysis result for SHA-256 f464772db77b37d5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 10:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bea6146ff2ebb1954441322c81aecb6e SHA-1: 1ede6caf6887e83d4da98e9f28829835adc8d1f5 SHA-256: f464772db77b37d5e3b9291ddac29f0c6e97e5fd100c45ce08716a84ecd7dcf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links, suggesting an attempt to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2ftnrvfhkbko0a65keqga79af0/37771190437.pdf In PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/rivuwalipokogoximasiza.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f25d42feb0---39816886810.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/96168838533.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbed505cfb1---sewibiriz.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/8668038576.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/8254150261.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/8632115141.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/rivigawu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/72628466167.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/49041034043.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/panupilomesukuzot.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/pakufupeda.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a017a67101b---62717352140.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/pedarugi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85c6e0d3841779e109f9969fdb9f7e64/pagiwulojabowiselevokawu.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/42602551631.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/30679580683.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/94556215010.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/6tlv4b98il9hghkea8bos239f2/35467671030.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/waputofolifaboz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5eba3e8c---20525522391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=copenhagen+burnout+inventory+test+pdfPDF 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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 17576 bytes
SHA-256: d55b86459407cbca832c1edf7c34b7d94a2a99757db6ffe97fc579e76df81ad6
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 11184 bytes
SHA-256: 57660bc81a4a4ae5b2e71fba3bf537287d52f3279689c1bf115b0a357acdd917