Malicious PDF — malware analysis report

Static analysis result for SHA-256 8600650bd325388c…

MALICIOUS

PDF

89.1 KB Created: 2021-07-13 17:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff19ab49b1e6360f1811cab07a3f6cc SHA-1: 972c069606211adba601681d593b4ee144e1c7c3 SHA-256: 8600650bd325388cfe53c5753f2d5acc9e92f2421ddb0d5775defdb73462fadd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://work4shop.cz/userfiles/file/jidol.pdf
    • https://dienlanhhonganh.com/images/pic/file/57306079361.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/81ec3e0b7aa0a1e54dd81a8c8d146eac/bomufivasinefumatajepor.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d5468034---nonowevu.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160911e7c27244---dejujesitujoj.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/770fbdddc4b819befba4b48655636926/xaseze.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075888c42485---xaxebilubiwisaxok.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176c2bfb4b---dimikizojara.pdf
    • http://tuderprogettazione.it/userfiles/files/73683135190.pdf
    • http://asokmontridental.com/userfiles/file/58943536241.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074254236440---bukebufofakaxizi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b651c011e4---63699637397.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/2ca495e7daff426cc0b10bc492b00555/6721167205.pdf
    • http://files.ibiza-ferien.de/file/97198433570.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/24a7f8e6ee85a404b39fe134c300c02d/76058179040.pdf
    • https://eyetracking.pl/userfiles/file/pizuxagemixukineritevugi.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5k8crfkkgj52l6v58alj2p8i4i/zikusotokisovapa.pdf
    • http://dnepropress.net/files/file/nowotiloxakexilo.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/jdnbslva83dl86dobt12r1uho6/44270195571.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/tnm1cu07ib7ec9hk70rh3ohtpa/16641707813.pdf
    • http://dentalclinicbangalore.com/uploads/lisavefetufelotov.pdf
    • http://growlink.biz/userfiles/file/46250376863.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/4qgb0qd27u0ra0mmkqk8k47i71/juxadezizudutojixiderivod.pdf
    • http://ji-tien.com/userfiles/file/zusupumofanaweg.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bootleg+movies+downloads
    • 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_off0000fa58.bin
67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16988 bytes
font_01_sfnt_off000126a1.bin
bb0c88ff966ca710a4fd112dbddcb6082924a3ae6b3ebadde7b378b858356134
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A1 10696 bytes
font_02_sfnt_off00013f0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 16792 bytes