Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e8a5a7f9ec734e…

MALICIOUS

PDF

88.5 KB Created: 2021-07-17 16:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0c21f75304b99ae643688e376b58ae98 SHA-1: 4a2614c694b5e11cd94b7c04971e071d4ec51628 SHA-256: 33e8a5a7f9ec734e2baced603e754300ef789d209e96204adc547ea3ee4e9ca6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The 'SE_ENABLE_LURE' heuristic confirms the document instructs users to enable content, a common tactic for malware droppers. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://allcreaturesinc.com/files/files/dikovojidoguka.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ce61aa3eb---43280616301.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af783d02e00---rerimolulonupuxa.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3cf8af61c68bdc19eb2e9dece588e903/sofirilut.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/86601643490.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/jinixitusezazovo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/numipevotaseje.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ec360f064e72337cbd440b0d1a684779/63249708783.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fb28121d---xogukezi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/b9ev41rr8g85b9vkdq9mdv6ghk/bixufetomudunax.pdfIn PDF document text
    • http://usmleworkout.com/files/file/dulumifadutikegu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/bb2a3e40477232fd53965dcddb7718f7/jakoxaxudutixigujamukabog.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/tiwesiniwabunudodonoxan.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ms19ftekqul40c2jgr9mdudkst/litoradimadebu.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/polirafoxixeforamomesagov.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f4c42fa62---sunaruregikevotabatade.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb269647c---zajenabisolozupo.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ad0802bd5b45a2c607e1f3f927212c74/lofemesox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eed7e6577---lovomivaj.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2c0221877a4c8a830c4ce3698a51ffa6/86538498964.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb206a488e---mezikukitak.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7f3533b6c906a42a3597e4438117dd93/53279717545.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7nb53hjlh271ccb6obc9jogs6b/45747082159.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a3a92a0d3c0767334c89d5a696558bdc/31343776749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=contact+sheet+excelPDF 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_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 10268 bytes
SHA-256: 88f944cfe794a6a3a0a9c41b4cc741cbf01c48f1aadf26358a1f8fb853859a49
font_02_sfnt_off0001275b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275B 17560 bytes
SHA-256: 43d551b6cd4e3594eb642067c0d2b58ff35931f13db2c9c858c3b52387be6952

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