Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4dde3cd8a5401d…

MALICIOUS

PDF

87.5 KB Created: 2021-08-19 21:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ecd4826dc8c9223728533851dbe9bbd7 SHA-1: 0cabc0388fca3a3e2c70ab16dc64b808f092b0b5 SHA-256: 5e4dde3cd8a5401d324c1a5f92536642fac201e27ac99ef1a5d524e353485cca
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, designed to redirect users to potentially harmful content. The presence of a link farm with UTM parameters suggests an attempt to disguise the malicious nature of the links and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kutscher-customs.de/gfx/userfiles/files/43590490038.pdf In PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/guwuf.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0176ff1b25---wegufogafejulitofinef.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/82072330948.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210618121947618.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/78981858438.pdfIn PDF document text
    • http://aven.su/userfiles/file/64461635446.pdfIn PDF document text
    • https://unosms.us/userfiles/file/rupobelowukek.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/425f0372d1cb3047a749950fccf8445b/97674203809.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/nisasap.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/xifejenamesetorerelozefuk.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/55302062269.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9c83f439006ab886b8b8ac31641bc478/49864566622.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/29893504907.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///32458066534.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052507045970554.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f527bb9e---77435680567.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/96287125399.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/23006823547.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/68203223422.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/jegetanawalabap.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rlcvolg8l5g9ffmj4k4bi8rd1c/24641358891.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/87911895335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=baahubali+2+dublado+download+utorrentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 18504 bytes
SHA-256: 65b913e07db48ccbbd67c86c8ab5dd68a267c11732de9324cda6b69c377e626e
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_02_sfnt_off00011c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 10676 bytes
SHA-256: fe10e6e0e015fd3c6796adbd816c3b47c356111ca36d4eced3270a01154166e8
font_03_sfnt_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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