Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c23204b3d8c3725…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 20:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4aea3df422709268969d6ea0780b6fcd SHA-1: 1e77c9ff69b604b66375b58c639bdf31baa75ad2 SHA-256: 7c23204b3d8c37251b481a9496714e3c5b40c98d18d4801b94e2edf39085584e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tomasmrazek.cz/userfiles/file/kilejefakaxefejewenudib.pdf In PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/72674041966.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/viwikojigizemesi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/budiwur.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/18990470133.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/kevejoruzom.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/jufawapiguxugobulufapi.pdfIn PDF document text
    • https://2winit.com/Files/files/70814789571.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/36551211617.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/893d13ecab48bdf238ffd1f80b097da0/12402230056.pdfIn PDF document text
    • http://yingtailong.com/upload/file/21090921431212098114z0duvgg3fp.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16143530adc3e3---87442500152.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/23180357086.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613752509a455---wiwunezixafidedixazuw.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/73055610608.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/47086326941.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/81197120483.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/nivutepunegutakubobejisad.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///kafivame.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/34804676825.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/40511595448.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/gudijawunuvizulenoxiru.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/kovisevifategojowira.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebabaa8ca5---28828887490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gta+san+andreas+apk+data+compressedPDF 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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 10668 bytes
SHA-256: 20a11d11876faff13f32b126480cf9bf1df73892db5ae5bc1785cca57f24f7da
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 17576 bytes
SHA-256: dfb668a427b2069467a4bca1c360212cf5c29cd4df20beb133fd4ba06d878f45

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