Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f971525d5a9b627…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 08:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b5bfe7b8f1b589af1158235528cab68 SHA-1: 7a7c10e83e52d00ca66d13e4feb88709c763a888 SHA-256: 1f971525d5a9b627ea92738b854f297511edc67f0a5af8ae02825146871fbe9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/221528f4e555835a77f6fa82b727e43a/21331681530.pdf
    • http://master-br.ru/img/file/lujosi.pdf
    • http://thanhcongtechtra.com/upload/files/93018097996.pdf
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/javegunafas.pdf
    • http://kyanite.tv/userfiles/file/15490059273.pdf
    • http://restravel.ru/ckfinder/userfiles/files/rowelowapubuzaketadebixog.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/fb621715ab202dc6dafd3218fa0c4a5f/85539160652.pdf
    • https://www.carrentchiengmai.com/files/xuvaluwafiwomapat.pdf
    • http://tpdw.pl/userfiles/file/maxolulif.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b27d3811e6dee79797a658a6e8b83b3e/losag.pdf
    • http://amctop.com/board_data/editor_img/file/202106250844.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610be2facaa30---44655407508.pdf
    • http://jiehuist.com/userfiles/files/73256796974.pdf
    • http://springbook.no/files/65983105000.pdf
    • http://agro-vostok.ru/userfiles/file/56675306055.pdf
    • http://arunimaflavours.com/userfiles/file/wulidejovukukawinesojam.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/42149912764.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///20217312057558072.pdf
    • https://mobilieroccasion.fr/uploads/file/36153519686.pdf
    • http://tuzvedo.hu/elemek/file/84447996820.pdf
    • http://squash-fitness.cz/userfiles/file/dukuxevowuvoja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bosch+rexroth+profile+catalog+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5d8.bin
b111ab2d1d997a8d40207c23db325aea3de2290415b98010af26cbaf57b89ab1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D8 10952 bytes
font_01_sfnt_off0000cf39.bin
a6ce04bc116eab5606537d8d92346606e80141ec7988eac3b2c1e9b8daf47ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF39 15764 bytes
font_02_sfnt_off0000f77c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes

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