Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff52f2ed750003e0…

MALICIOUS

PDF

73.2 KB Created: 2021-07-07 10:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 58061bfebdb69e1f530ba5545c1464d1 SHA-1: 6ae0a1d2dc3cdb2a9af24e874c7a701861514e4e SHA-256: ff52f2ed750003e0514105b70a1a48b8669bb583e944e40ee3e020f8e73c633f
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the nature of the hosting indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160761833e68b1---84303524854.pdf In PDF document text
    • http://elm3rad.comfile/degidumafatunuxavot.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8652eee1---jufur.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/17477020886.pdfIn PDF document text
    • https://proia.bg/userfiles/file/werawefumawaxobopemadopox.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/14168985414.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/2231f506a3470ac13be1e65dafc4e31a/45806210132.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/surafotun.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/91687407795.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/tetinuxenigaborikabo.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/90836876238.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a4465b26b55c09e7a5e0c40122e0cea/wazexuxasokevopinefezikuk.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/musitugedozad.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd005678b4---49473847987.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55cf6e9706---26651424155.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eaf63aaf9---79361370056.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61f0c09143---65515022604.pdfIn PDF document text
    • https://ebooksweb.net/files/file/ziwisa.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24afe85ff---jikabag.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/dafepodireb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e0673bf4---2091341425.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4515f4225dc49f0aab85b0d4d8f4efb5/48430011103.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/dazakevev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+fast+and+furious+hobbs+and+shaw+free+onlinePDF link annotation
    • 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_off0000b9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E7 16832 bytes
SHA-256: d2d49b5f3e9c07e323ebc407f6c25af4308126acebd7bea5b3b046fd5c33ebc1
font_01_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 10892 bytes
SHA-256: 14bb18381fe377997d2b82be3aaa623930e10f61c3566e3e2652d030ea5937de

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