Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c750ef873330f6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 15:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ead007dfed82b3f74686366e3b51ab43 SHA-1: 3f22b069c9f48bc459d9e7f4731c12a45a2dc18a SHA-256: c4c750ef873330f6b37d62504563dfd7c6fbe92c41cb167fa89cda46e3f73258
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a likely phishing or malicious redirection scheme. The embedded JavaScript likely facilitates the malicious activity by interacting with these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=life+apk+download PDF link annotation
    • https://mpksieradz.pl/upload/file/mizudipukuxirop.pdfIn PDF document text
    • https://fong-cai.com/upload/files/komasesufinozegip.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f3c57e5dd---94534621266.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac151ce0f---54246420818.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138cd52ed9fa---julovupomalajoriga.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/wenazinalirifod.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/mozelesusugegav.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/826157315.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/nigeromojelimajip.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/btvvv8iu2qiukpa6l39lj9gp66/lazapawovuruzafama.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/91067804498.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/figipisezimow.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/xakuzejalenixaxi.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/xolujabalodelarukuro.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/39277656441.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/sagebaziba.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/8203087902.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/zuponevukijazabaniv.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/71269893967.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/12907433968.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d038623e48---42197961298.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/zexefasi.pdfIn PDF document text
    • 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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 10260 bytes
SHA-256: ff3f81f2fa5ebac09171afdcf0ac0a69acd407d8a5dca7e3387df610da9f839d
font_01_sfnt_off0000c923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 15968 bytes
SHA-256: 5411db8b8caae469b453f8aa9486d6dd1d5c9f3ab8834ba0174fb8444915ed99

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