Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb359eeec0a0d246…

MALICIOUS

PDF

87.9 KB Created: 2021-06-29 18:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4706ba92673696a004d1584e8704fdce SHA-1: 7bc2e9ec9a67e7e493c1129c745281290cb747bd SHA-256: cb359eeec0a0d246e8821e896b46e80f817f2006572f27726de0be2958848ba1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a link farm designed to obscure the ultimate destination and leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/59541e95896403c3fa75dda3a61f66d0/bidivamadiju.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079561d6ac20---vilewatabep.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609db39f6265c---37824630756.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d8523cac---32989735014.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c323becf7b---94580157084.pdf
    • http://marthomaiticherukole.com/userfiles/file/segerowasibu.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/7aaa02dcvvfmck6096vrgpebod/59340919560.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/rlmpqdkjntiqg204d9g7n8ui36/52878526135.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/naguvopopexufajuv.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757774181d2---dirilewokodevuvenaragetaw.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/87742685322.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/616bef9c7d86842200108fae6e933769/xatewokesomuforide.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qafptasl4vnl2ilb7i60n2e67q/zufif.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4323a2860---90565361912.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/a88628bd5d20e01ceda9492e49a94129/dakorasitomenuwatowu.pdf
    • https://leganordavigliana.it/uploads/file/funonewizazefabowajoza.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/41096622635.pdf
    • https://harrisitalia.it/uploads/file/zodefetoxoperiwizovog.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b579ca5d---gavunizipitafogigev.pdf
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a16108d9---ziwiros.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607621996a04b---76524713014.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/ufari2vq0gibbsc6nvolocji7o/dojasafukivuditowarejevo.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/491e1595cb31290ee46b5a8cb35443e2/xafufigagap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+asexual+person
    • 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_off0000f4e0.bin
1df864251d167cec38f4fbe2e8a0ea5b785d082467d7b0a3dfe7ea156d59db71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 17252 bytes
font_01_sfnt_off000121f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 16792 bytes
font_02_sfnt_off00013a10.bin
dedb3620e103404dc4fc971eee89eab79aed5587a13c595f8a2252a78900caf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A10 10632 bytes

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