Malicious PDF — malware analysis report

Static analysis result for SHA-256 90849d1902390100…

MALICIOUS

PDF

103.1 KB Created: 2021-06-24 04:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31612f6b1310f6cee816c2ef5551e8f8 SHA-1: 13652df7471c78929f69d256f42e91d2cff08725 SHA-256: 90849d190239010092d73c1345f3ee7454d6dce9b093d4ae4911fbc9064f867b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crysiq.ru/uplcv?utm_term=solutions+to+partial+differential+equations PDF link annotation
    • https://contact-house.com/fckeditor/upload/file/mixupinezuvinef.pdfIn PDF document text
    • https://laser123.com/geektic/files/fisabinuxox.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922d087488c---5300665956.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3c9fb1905876e85e2c23ece7f4b7f38d/memipukuzi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07c557e7d---dewobavoxodiserivozoki.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6985da26f---22933766389.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d11f16df---wezogijufolefatinuvagexi.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f4034d46f2014959961520acdff7969c/kobagunizelitusu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cafb631185---80216384973.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ded768b9f---28630754625.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e89e5f14caaf593896aa038979ee2bf5/tivawa.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/26651033927.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/dixurimimukipe.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/60645749759.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/6af7c6eaeb7f5cfa5a939dc25c855a18/97270373220.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/85dac4e778672febe30b28d18862248f/76790288231.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pagajebakupiduvoredadi.pdfIn PDF document text
    • http://essuances.com/ckfinder/userfiles/files/xazub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 5264 bytes
SHA-256: e0f35e0524b9a8a8a4b4a1885bf051715cdfcc120beedf226b3ff19ec55861f8
font_01_sfnt_off00014796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14796 14592 bytes
SHA-256: a411146a8b45a67964cb529a0ce00cee2f714eb4d84b6f0f970424f51f6e2d90
font_02_sfnt_off00017757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17757 16488 bytes
SHA-256: 3908df9d74f3f75fb0928f902817338b975be0a5ff58fc0e0e77d0200ccb5642

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