Malicious PDF — malware analysis report

Static analysis result for SHA-256 c481467d3f9c30dd…

MALICIOUS

PDF

112.3 KB Created: 2021-07-05 10:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ea52903c2e3ff9033337963c303501f0 SHA-1: 9bb2e15736545b3b2792bd2459a16c1d7b96dd33 SHA-256: c481467d3f9c30ddf02f8e61c18b681baf1395b3d631f031e0958dde53d6fe83
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple distinct hosts and link farm characteristics suggests an attempt to distribute malware or phishing lures through a network of compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b886a51f610---55997918281.pdf In PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/puguxerisilolafupigumid.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b8e926349d53469e2c9c6ee208ea4b09/69710507389.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/e0334b922b49e18df03f99b85ae4c702/luduwujivofoxaxevokiru.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/2034694934.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wixokobukatovugijewaka.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3df629bf86---riloxoferasixaduliwenof.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/5793fe7476e8b7e59d836601157c6578/51083328103.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160959a2bba7f0---97093157719.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/fbd19079f3eaeb072409e94dfd44bb9f/sirigene.pdfIn PDF document text
    • http://yuha.be/_files/file/wabujoduxufajuzoxinane.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/28751931203.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bddfb3f01e---80969031887.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/kazexuxefaxobuminumum.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/02f958da54da8ed0e725b6fd3a071873/27518384125.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/madejolit.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/gutumajige.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/52618817231.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4ecd65e26e84e5e8ad3a6b9f2362ab3e/zinedawanafukala.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/kamabegilarazuwol.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/63909515381.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/p9pjf3o8usdjl7su4avfcibotk/37969247105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+human+abstract+poemPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FD 19536 bytes
SHA-256: 793ce966f750d2308b64de7c377fac1a28ced29fa67995d48139b4f4b64954f2
font_01_sfnt_off0001771a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1771A 10704 bytes
SHA-256: 1be579a4835cfdddb8c69700794551b1ff0628093afc2221f02d73b47146b3b9
font_02_sfnt_off00018f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A75B 2508 bytes
SHA-256: ada45717a0bcf980302b7ebfb33c277764f719350587c95ae35bdcdf5136889f

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