Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ae44606b95200b…

MALICIOUS

PDF

73.0 KB Created: 2021-09-22 12:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02e4b546d8559a26392eda41488d9081 SHA-1: a0e4bbb8a8f20ddf35a5302076182310fb33064b SHA-256: b3ae44606b95200bc4ba03616299fae45c03c371a1bed53fd1f2a22e0f03753a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cancercareresearch.com/userfiles/file/44137284561.pdf In PDF document text
    • http://denetimmusavirlik.com/userfiles/file/vesopubagibipozenotuj.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/guvarobabirunuji.pdfIn PDF document text
    • http://pasted-radio.de/web/files/39462446309.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4c6c398ca---77501784133.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecd6682f95---lubezubi.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/69830283866.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/49fj59iub2udghgp7isp6k1vig/57853613387.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/93934926510.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/fd108de4263db824005e1d127a6d5873/lexupaperakosiwidi.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/wixaxedobu.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/59310517860.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/zevikof.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodetukatum.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/zagidolumovadefenuwuw.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161398f5c5e81c---bopefetimasanapiwutitu.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tipowakajividilisolikova.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/rulego.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148f6bcb9633---39063806725.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/rukogozufinurugupikufa.pdfIn PDF document text
    • http://zerosquareonline.com/file/kuderawuxujuner.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vubojelusub.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/42625427658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=facebook+id+hacking+software+for+androidPDF 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_off0000bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6C 16212 bytes
SHA-256: 2e86fd30384babe23ab2c0af2c9a553f94abe93878e9b83743bbeeadb9097d66
font_01_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 11004 bytes
SHA-256: f44cd7314b21bbc614309f59f6e2e9b674c844726beb0c4d00bda6e43510dd60
font_02_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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