Malicious PDF — malware analysis report

Static analysis result for SHA-256 9889e7a8eafd0cfe…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 20:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f4929d31e335165965ac095c70464a24 SHA-1: 2366aa85c32cb4ba4bdc630d5e0f720ff4c7cc2b SHA-256: 9889e7a8eafd0cfe28186c315577295b06f3d230659a399deedfffb795ec03c9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The embedded URLs, particularly those hosted on compromised CMS platforms, are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71561e4aee---73375750828.pdf In PDF document text
    • https://rmduncanrealty.com/userfiles/files/69312776879.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/benarabos.pdfIn PDF document text
    • http://allycatering.com/userfiles/75590111064.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e99c99870---sajemozajana.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a39faa2339a---bigor.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/74520356279.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/luzedow.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/30995035774.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/semuvutaviviperekipode.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075de991bbd3---japabedobetakej.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/tivanogugobujefuda.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/zurutapudivowenajim.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7539310d80---larezatikabowane.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0cbb481b39067340e6568f54ecaa039d/gobasilizabutitisux.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b41733b6---59998563149.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3o2542or985jqkrvhnppns9fi7/84188775642.pdfIn PDF document text
    • http://atya.eu/files/file/watirorodemu.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/46842834471.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/40580422932.pdfIn PDF document text
    • http://strandedtattoo.net/file/fusolawigero.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/kolomekiwid.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/butegeko.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/86437792289.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/96803defa649ccc38606c056c312311e/9688376622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=lwc+salesforce+pdfPDF 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_off0000d6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 10364 bytes
SHA-256: 8b251e211348e8d3ab081b1415ca3fd3d55565b0459cc49975884254b4632ac4
font_01_sfnt_off0000ee62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE62 17584 bytes
SHA-256: bf92b13bac982133ce79b90e4bc3795d55c669c8d66c512bd1cf9e0599c256ba
font_02_sfnt_off00011bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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