Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3e9569861baa89…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 22:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a94dc76e4444b48f6c737c76fc919201 SHA-1: 28b598bd6b521a4da250a9bdc0621e5b40981b6f SHA-256: 3e3e9569861baa894f954572a7777ccab6a5528d82410db510c2dd3c2a625549
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content or conduct phishing attacks. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=godzilla+versus+king+kong+movie+release+date PDF link annotation
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/01275a3381cace9dbae63bba61a227db/dibug.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb682d9f5c---vibozuno.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/43fdcd2e948ba8b18ce196838aedb022/zazuso.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9e3c264ee563e640454fcf8082480d22/15973176324.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c51f4a14ab2ef2c39f46ed0e302d9efb/77799620707.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160978be3a08ff---7889342166.pdfIn PDF document text
    • http://beiks.info/public/file/dedadupipapafuvit.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/18355780887.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kironazowivasu.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811de5d00a9---71496096769.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/qq49e1mb6u521q7i688pfhrvhd/gopolaxonazabuzalo.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c0634c07ec0746015504fa5e1ebaae98/26095294004.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/marolipagawid.pdfIn PDF document text
    • https://morabia.fi/images/file/41366196559.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/530e3ebc3461ad38dd7b3a0d5b030e9e/farib.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/79481635249.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/da01012c02f2f6d5eafc4e0582956b0f/60231224804.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c625ab7f256---rutanisazu.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/kutewemaralujonivojor.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/952232841b9c54279d3b06c0418842ce/25890878888.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03cdd378e7---mitovumipujege.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2ikhoia2re9bka3vcfphvq23cv/vuvoz.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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 10948 bytes
SHA-256: 58d1ea66dbd7a2e898bb3431b4485c054af286df8aeb1a578f7482d2bee70807
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 17940 bytes
SHA-256: 34f7683f43db21e96e01fe0a439129e0ba41f1e7a2ba8a26f89a17e3640647ba
font_02_sfnt_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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