Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb85a399056ad39…

MALICIOUS

PDF

129.8 KB Created: 2021-06-26 01:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a55378ea6119b03879f2e6b860ed1fc7 SHA-1: c746c397fb9c741aafb2e694cea8a7c396a288a5 SHA-256: 4cb85a399056ad39300c15ec9cf69bf9c0ef7530c4fc2617e34331fe85b2b1d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/15c28b9faa5966e97091ce78aca82e95/66653967091.pdf In PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607349343cd5f---ripidezezekade.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69ec935db---xejevuweluvo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685a4621a0---puferu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2dcbca38e4201f47fae47c8d3bcf3039/kuboguvagujedagikurif.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3aceb8a18---67464377825.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e73501ebc78166c80c22d2b2482f51b4/88237901051.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/77240580181.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/tovipabirifujebekekobevo.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/vojibosez.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e359e484---16154296466.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/zarovalijasupegiw.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5041d9553---serozunevoliputi.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f94a94d9a39446d6063e99e893558551/5750606240.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/54931426422.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d648cb72f1c---94537708935.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/bisamixinesefi.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/27168843797.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/86493828349.pdfIn PDF document text
    • https://go2germany.ru/files/file/43986511984.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/of3ceo9msfj0eea472hhr3ckr2/87676057140.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/66195008044.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b28bd068512---rexafemetot.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e2948a5a---maviz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=jason+stephenson+guided+meditation+for+anxietyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000192a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192A3 11208 bytes
SHA-256: 9e1cf2da974b50478869e8e3f6554158ee7fa15b86dfa94125538ab70500a96e
font_02_sfnt_off0001ac82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC82 21408 bytes
SHA-256: c789a3adc1a291afbd8fb552addc1a897ba2362374d06fecd4dbd3d82c723a6e
font_03_sfnt_off0001e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E282 16228 bytes
SHA-256: 11c5a07d087146020572b41e3c25cf6f3fd7b709257038c787216a38c3b0495f

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