Malicious PDF — malware analysis report

Static analysis result for SHA-256 443bf23f3795eec1…

MALICIOUS

PDF

93.5 KB Created: 2021-07-22 13:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 76f6f66fbc0bf9fa1ce33074e17eb860 SHA-1: 187c2aeb03cf1ad44f953efd4e1b94d64a0d11bf SHA-256: 443bf23f3795eec15cec3166f292d3b48f916fd94ac5643a29de1e537165ce5f
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 URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation for malicious distribution.

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://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/fa4060215ce698bcef834e7a97214205/10049800032.pdf In PDF document text
    • https://terryhaas.com/wp-content/plugins/super-forms/uploads/php/files/f75c66476754ea8f60e35d703a5ba4c7/92044085848.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/ruredavevenevuvipepezodox.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7133d7737b---viponoxavopasatawub.pdfIn PDF document text
    • http://abpaluso.com/upload/file/93655957265.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c282c323699---gofatinefudinowemabojik.pdfIn PDF document text
    • http://vinmexindia.com/uploads/rebozobamuragufe.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/9404834500.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7f736bfd---68017593837.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/kiziponixorag.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/59670377435.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/e0sjoglukmbj7ri5j0g09fp80r/tesasalirepemapixabavodup.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f05c5b9d1d3---84034696106.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609665b3a83b9---dajagefaxakirati.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b07084b316c---72437074315.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/84116356218.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/xerirugumalibexojigew.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/biguzomakaxuvamixeziboxot.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f2ae941600726f5e0e3aa78a0864097c/64555760200.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/66266686445.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e7128f2473d---6029816914.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e73b6e29b---famubebos.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e79950b17---dulaloruv.pdfIn PDF document text
    • http://dothi.info/images/files/77985632065.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ca1bab526e9d835dfc60b89f9d2c5eec/88433816079.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9c2503b2b9ce1fd3fcba5fb1cf55dc07/rorasatu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ab9956756279129d6cf051268faf555f/ridaberopum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=history+of+operating+system+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_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 17724 bytes
SHA-256: d546ff63689eaaba8a49feffaba18fa0a8ead0c6acd9e379f1a3aa5dfed23bf7
font_01_sfnt_off0001365e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E75 10900 bytes
SHA-256: 6d5f54e56c625b53ac14f050464f8a23ba0ce4583a617dc97a1900a18dbe7c74

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