Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb825ec034a9433…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 18:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ea025121aa567941b2d5038ffcfa486 SHA-1: 1bc812c4267684682785a6e74772f756911fbfe2 SHA-256: 5cb825ec034a94332b7d3e78b5b14b0ae7daa5a3e746c9caba3b3cd9f971d4b9
164 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded links, many of which point to external websites, some hosted on compromised CMS platforms. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading further malicious content. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=biology+class+9+textbook PDF link annotation
    • https://marcvandewiele.com/userfiles/file/84512914646.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/87062383057.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xobuxitizebev.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0b6659ed1---sutigatobulowejukuragow.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/58951531292.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/xaviruwojalonew.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351a02dca9a---ribijatu.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/1383181712.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/61758536040.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/nobisapogo.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/30261660613.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051013178688.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/13983855156.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/99753386583.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/sewuravo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec3ea723b0---jazovopekeg.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/45233754354.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/fopuvorudunux.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/21295772716.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/572b1532faaebc58aa8f37a9f267410d/58521461295.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/loludupujeroxoxa.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/92581426264.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/31194204386.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_off0000c7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 17184 bytes
SHA-256: 8a0567cd70990a0503f141f0b570e3a748790a6efcd19a04a9b69328a399b97d
font_02_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 10868 bytes
SHA-256: c0acf58439de41aa095ee7c0059fc1fad9b760fce2abce4352abc45773473e5c

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