Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc2e25c66fd26a32…

MALICIOUS

PDF

78.0 KB Created: 2021-08-29 15:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f85b04db0d81dcd98d7128ef4da36f5c SHA-1: 7a8c9d3ac124aec48023945a8b34fd2784f42760 SHA-256: cc2e25c66fd26a329e8521ba35247b33a879e5c1f4b3d1ec6b3d5fe52ac7d0c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=how+do+i+get+bigger+breast+in+1+week PDF link annotation
    • http://ayhancevik.com/images_upload/files/julajaxaxavilomifa.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e624711a44---97225359165.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/90360810f2497ffe9b4f47ecfbd8746c/kusixixapuzevifajig.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/79340129263.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/8931723713.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/32194213911.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/21006101623.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/vagijebawofaxiruxenotomi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/df46bae77664b60344665b0baa930028/68932366282.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56f585e16---60176427282.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bdc420cdf7d489d5332a2ecc96f723d3/28407974149.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4e153bdbcfb932ef2394ab27db378cc1/gevabakexolituzaxut.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/bodapibotozorarigavugamem.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/72249706072.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9dea33f6974c3c45bc05ae115a06ac61/pojabavenirefij.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3aadl40uo9eqmcr2qvf7sfrajl/kikozevevatosutobu.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/68760665066.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210820_DE9D35BAD699EB04.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/62088015508.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d570a61eab6ebb7a5338ded5a93b1eaf/48315515253.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/kosekefefofona.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/2719439662.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a067433127c---20412516477.pdfIn PDF document text
    • http://lawngo.net/fckfiles/30563064857.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/c81e77e493c99a960ac74c2240c18111/68840233509.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/28768693442.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_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 10736 bytes
SHA-256: 233b0ba7aab9a8265c96913cdd347ef272ffacc243389e285a40f5930521a984
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 16132 bytes
SHA-256: 8123328f03fb46da2540fa82be461594d961a3e3845cfe9c12760f00cd5df844