Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b3d5b01c5f1521…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 11:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02c044a89082093aaa7c240eddca737e SHA-1: 09c1767ed4f56385bde7c8a59b8a0a8f7e751c1d SHA-256: b5b3d5b01c5f1521e4cdefc918a316240d9ebce046871834d45193be4dc8a798
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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 https://medvor.ru/uplcv?utm_term=best+internal+sound+screen+recorder+for+android PDF link annotation
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/54187591527.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/xaxukuribufesiridivusated.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/77732348066.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/99117340829.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/72113204479.pdfIn PDF document text
    • http://electric-kernbichler.at/jodulafida.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vozutiramorolufifumujev.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/64229244218.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/tetumuxisevoboxoxodejum.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/sokogafiwuvexavajibi.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/33178027915.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/dc73198338839695135fb0b843d09e4d/46584334410.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/zipapibugenesepanidojuse.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/3841217808.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xekalipaduzovomuku.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/95269041951.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/19197174618.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/81005113068.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109190633545744.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/zaxujawibejamoxov.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/78892532093.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161414fb23391f---95001649124.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/vuvejijudapi.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/18397692646.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130202891bb0---jalezob.pdfIn 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://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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF490 17152 bytes
SHA-256: 96bc2de3ab7a254ab1533869927ad94117d1b459c913f704a7f0df593b6a0ff1
font_02_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 10624 bytes
SHA-256: 0f402525ae9176d188a11342cfb7cbaca727d7567dbec42486d8198f61c4583d

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