Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f501a75f5acfc0…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 05:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f587f6daf0987da7d81f68d687b1d293 SHA-1: 7b714468dc02bb6d01004f681256457e2db6967c SHA-256: 98f501a75f5acfc052b43b67f56484f8a9be5a22be13bc83be16706eecc31714
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/38607798876.pdf In PDF document text
    • http://cyuanmei.com/userfiles/file/76888696730.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909043524.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f432bb2e4f---rularifofuguguwi.pdfIn PDF document text
    • http://westhygiene.hu/editor_up/vawurajomekeboduvo.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/kasavigiv.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/dezaxubibogobirabijoromeg.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/loxaxawilimopufobakikame.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/9138034738.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/57104691155.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/92200606013.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/borosapaxemovimifexodoso.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/fogutifekodisu.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/54571350564.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/37022783194.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090217070442.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/26687165972.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/50594656917.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/fokudidizoxekuvolanefuge.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3qg4466rrghhh3u3nfamihupjr/tufop.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b6a48b07ade8e2c5da8d774ca2aa4bc5/fadenunefamudulawi.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/rabasukajig.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/61915167532.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/budatavaligojimofuxazali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=clash+of+clans+mod+apk+download+unlimited+everything+2020PDF 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_off0000b9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FB 16208 bytes
SHA-256: 00d573e6bbe1df12bce598693284a6c8f61a6fab5e2ef364ff5e25bc465621de
font_01_sfnt_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 11800 bytes
SHA-256: d3aacb208a4f744c2420735fb71b4a1c92cd4e5a70f649e1cd4aa846cea4a7f1

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