Malicious PDF — malware analysis report

Static analysis result for SHA-256 663d61d3130e3d7f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 04:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ecfda9d9b0fc83ce17744a21d8a98e5e SHA-1: 8d8b5331a0b815c42eb5df115291905072aa57de SHA-256: 663d61d3130e3d7f2cd36aa03beacd83d919ecbaffa7e1dce980f3d25ca01963
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or initiating phishing attempts. The presence of numerous links, many pointing to compromised or disposable hosting, strongly indicates a link farm or phishing campaign designed to redirect users to malicious websites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://abwmountvernon.com/uploads/files/loxomasamim.pdf In PDF document text
    • http://shbaicun.com/userfiles/file/2021090608023173499.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/57e3c779feaf1c2fe583a28c2808df2f/nupusomaj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368757989d7---nogizubibimufebetomib.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/nimemerironivilerasiwem.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/57465392310.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/sumisibimikikaridusosaga.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/81184182985.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/bisedapoxaxu.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/rizifiwe.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/15903825256.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/1233942730.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b3bcd454---78768402959.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ot1khtonbccskmp1q3kpq7irv5/jumofoxejakapum.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/65328525389.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/livase.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/leletegege.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/veraluxetapesebi.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/30665034411.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/59259818506.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/77188250690.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/zezurejumanunorezomavozo.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/45897618589.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/96794951214.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/rilemumo.pdfIn PDF document text
    • http://rayer.cn/d/files/fojisikikifawuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=santharpavathi+movie+in+tamilPDF 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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 10488 bytes
SHA-256: 587c2ebd1c61f349c63a849b1ca232ff9314608b573486343ad3579aa96827c8
font_02_sfnt_off00010659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10659 18020 bytes
SHA-256: 92f72abc7701c4e3f9095b2298120d0d533ddaf5587b3ece83017f1afa8e2c30

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