Malicious PDF — malware analysis report

Static analysis result for SHA-256 2223953d4f70712f…

MALICIOUS

PDF

77.9 KB Created: 2021-10-15 20:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f5707ce7406bc780834c82b080f6740 SHA-1: f38331404269733b32b5bb326bc2340c84fc8369 SHA-256: 2223953d4f70712fad02240280497c06dedc29a86bcdca30ce986ba7aa1480d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely to host further malicious content or phishing pages. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent.

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 https://catamma.ru/uplcv?utm_term=how+much+to+install+a+cold+air+intake
    • http://akconta.com/uploads/files/jijef.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/cebec36298554a293900f20a96e22274/91545373228.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16150d287c3545---sidipud.pdf
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/nitutuxuzirutosigabididef.pdf
    • https://aawyx.com/sites/default/imageuser/file/75611402550.pdf
    • http://autothudo.vn/upload/fck/file/32369515127.pdf
    • http://tubietelbar.hu/uploadfile/26010435634.pdf
    • https://eltechma.com/zdjecia/fck/file/64922540810.pdf
    • http://rogatka.osieczna.eu/userfiles/file/kirobokugezudato.pdf
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/poxidaravevadoritofi.pdf
    • http://reguitti-engineering.it/userfiles/files/juwedigunolakep.pdf
    • http://mobil-tech.com/files/61886115966.pdf
    • https://hujanuang.com/contents/files/55259876090.pdf
    • http://skulpt.in/admin/uploads/file/140653255.pdf
    • https://cvssteelex.com/ckfinder/userfiles/files/gonoxujepidatasigo.pdf
    • https://tauthuy.vn/upload/files/97040850871.pdf
    • http://ipea.kr/userData/board/file/vapox.pdf
    • http://stillincontact.com/images/mails/file/sifib.pdf
    • https://kvzriu.org/images/file/kekorelob.pdf
    • http://resurrection-life.net/userfiles/files/51869703007.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/xajovusilo.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kd827u9beoh0m8eabnbsotg9dl/39573323540.pdf
    • http://architettosirocco.it/userfiles/files/davisalenatetezul.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8d.bin
550f0d1fbec321d12ad685434232fddcb285aa59beb6a10c9c027ae898ab4b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 16140 bytes
font_01_sfnt_off0000f843.bin
0ce0bd9c991412c8087fa05d1c1a248a02028f8a1a76b4e6f2abf8b2ef130412		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 10904 bytes
font_02_sfnt_off00011158.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 16792 bytes

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