Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a24621b227bc3b8…

MALICIOUS

PDF

99.0 KB Created: 2021-07-02 22:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fe9135d469aa24a2e63aee354b64b2a SHA-1: 25ecfbe753c85ef4a4f416af31832a9eec7aa4cd SHA-256: 4a24621b227bc3b84e54f496eda7522403fd007a53b5ee4497bc1356708ba42f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f391eea5bf---kizajononozawigu.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/95a990db492e06d7b199a93aa807bf69/2658974186.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/orhq1k350tnr3b7gek3itg4p3f/97746241711.pdf
    • http://saovietgroup.com/upload/FCK/file/22837129276.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca037728547---bavawariwuxipevixaduz.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/v86q5ku85efsfiqqq8dahn246s/rapawekavub.pdf
    • http://93564497.com/userfiles/68887917551.pdf
    • https://fong-cai.com/upload/files/wotokebejexufozir.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/14315bdf2a8adbe174f6a65262e0e7b1/litin.pdf
    • http://absolutelyneon.com/userfiles/file/48167169678.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608347a262b52---26149363277.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fba4e37934---32547462801.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2b9829f325e4599e1a5ba4ca8192c17f/51266129140.pdf
    • http://aaaexpressac.com/userfiles/file/25017362320.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37af35f02---48196897218.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/6e27210a55c498a33d51f5ab77f28655/zelanutugi.pdf
    • http://sns.hu/_user/file/zotoketamemufegexefunilik.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80302b5f5---40158587922.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/tlm4hi7u7nccr7ei4tgfj28pk4/vurovebaxisawafam.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/44865488218.pdf
    • http://palaciodelosnavas.com/userfiles/file/7357058575.pdf
    • https://peiitw.com/Upload/ckeditor/files/dorafegejoxokepowe.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7fc589c---femajuwizininixugizusa.pdf
    • http://scandirent-new.ru/uploads/assets/file/53078430726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=growing+cereal+rye
    • 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_off000120e8.bin
9d30a5e228683389b647d4be9a714c67520a3f2d422713d54f64138178195e66
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 17688 bytes
font_01_sfnt_off00014f10.bin
138cfa044034e79029be98df5cacd46d56ed8686a2bcae290c03f926ee1f7e04
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F10 10380 bytes
font_02_sfnt_off000166b3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x166B3 16792 bytes