Malicious PDF — malware analysis report

Static analysis result for SHA-256 332010e388483bf1…

MALICIOUS

PDF

82.5 KB Created: 2021-08-23 14:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 560b74687d95052eeb35c3b1eecd1518 SHA-1: 7847432551256b7f8418bbdb1f8f8a129e21cb9b SHA-256: 332010e388483bf1c537529b5e32630463e43e0eb7cb42c2b6127d3d92992567
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of multiple external links, some pointing to compromised CMS upload directories, suggests an attempt to host and distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

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 https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d18704a328d3e8a886b8ffa537c0cb34/wujexavifu.pdf In PDF document text
    • http://www.abcklima.hu//data/editorfile/99888223781.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/48044821189.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/5247260893.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/41673369574.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec821106eb---murezukopunubekasisimel.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/04b8b0ca430022cf858d019f415b2243/85559778007.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bukukonitukiguto.pdfIn PDF document text
    • http://sartor.ru/upload/files/roxewenidej.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160916a5445e1f---lisovaw.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/jefuxovojan.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/dapur.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210624140430_1770493988.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/30f6b5820635edbeb18b630ff0062a28/nakebewagozajuvijoxepe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///90040781167.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55ae7756e---gipedijemeluzukonutakipod.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0a4ae46f5a5a4ef3100dbdff80a60f76/runenekav.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/10030273633.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1f965e811cb9ba2980ba4ef656e65678/85789334759.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/muwokexasubozemawifibaraw.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1649811b21---zufidaneweratesizegi.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/21860761631.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0777cb29---tekaxel.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/jukijuxulu.pdfIn PDF document text
    • http://bearcatbb.com/CKEdit/upload/files/nagiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=first+jaeger+pacific+rimPDF link annotation
    • https://lapdonline.org/file/xirexa.pdfIn PDF document text
    • 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_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF762 17300 bytes
SHA-256: f9c552e8aa462ec03c4359bdc2bb68e3678f273bae060d2a958e5ea76be2537f
font_02_sfnt_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 10660 bytes
SHA-256: 8aa41da860daba7ba80d3db907ec22f92976c603768077165ab600acb04306c9

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