Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bca90d06811eb77…

MALICIOUS

PDF

85.9 KB Created: 2021-07-17 10:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1d58a459f29bc773d585e05d2659ffd9 SHA-1: 5917cbcf4d323af7b362da2c326924c4e52fb022 SHA-256: 5bca90d06811eb77543420cedf4eabd9c7967ab2b228a8f6ea275d5515da29e1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alakharia.com/public_html/userfiles/file/76528019661.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/m5u4c5h9n1419se35cf4rajb88/12531460980.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f7ee6f0c48ef34ae407b5947a619d059/xezilevekope.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/88306903da2610127f64d16d363bc1ff/kukiperalokozugoxabo.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070204424373499.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4466b4b05cbbac2ac225a40e7dc568f6/koriwuzovomevopesufovo.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/pegosiw.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/81335481104.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e08c4acb37fec2e77337b34c64ece9f/46978827089.pdfIn PDF document text
    • http://lblussana.it/images/file/detigimud.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/41415079919.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/39508627607.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ij6vr2edbqsiblt8id1pfm0kej/60873346033.pdfIn PDF document text
    • http://e-hane.com/files/sesovenofowutupokul.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/89684721321.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38dd6d0f59---92017202495.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbiefrb5f5tlogvu7vdjq7u58u/89582571464.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/85272816411.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2a6ba7a1---maladopixepatawabe.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/39c8ee389ef27c482aa0656be1332a58/fafegojoxalimu.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/glm96m808d37mqe3vu54s7lof5/35958705987.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/87158896418.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b4c0eacf2c7ac221e047c80f82a14ff7/80959585810.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf920bbf3---37506312002.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47c86ad28---76497871584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bluebook+citation+for+black%27s+law+dictionaryPDF 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_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 11088 bytes
SHA-256: d7418c6d50f3638f1fc8e5c076c9b41155c9d6ef78ff12923c98f0aaf9adbbb9
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11909 18396 bytes
SHA-256: ed2129c1ea5f705cb589901b306216f6c1cf0d4bd91b136c4292ad8ea0b34f8d

Open this report in the interactive analyzer, or submit your own file for analysis.