Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ca691e1021358f…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 00:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7fc3b595408cd1a19efbf20b4565ce3d SHA-1: 35c5436456bbe0c1cf015aa59e6d4728a039083f SHA-256: 89ca691e1021358f2dda52d300a09ded6efae3c5d459c179b96f1317659b4b4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=popular+science+magazine+pdf PDF link annotation
    • http://baltic-rt.ru/ckfinder/userfiles/files/95894614386.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/janujopabikurusurage.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/weluxupirazup.pdfIn PDF document text
    • https://dm288.com/slicice/file/93445823267.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/xotonuvujonexibesalobiso.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/24094003839.pdfIn PDF document text
    • https://tantecoccole016.it/file/39233739757.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/pogetulatuteroled.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/77fdb55f5cb5c0d0b5d093303f866981/pitubomozebuzasu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a91d1bcb9---26596376502.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/wemitabamadodotafomogi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/l0fl38posnleq8ek2r04k0f6ii/1084967848.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c877040a6c---gufesiberus.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/78bbeedc7771ad185712ebfe74531c79/88714370514.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/fe46fb71092aafd436e17ee154de8678/87471212304.pdfIn PDF document text
    • http://rts-3.ru/upload/files/xewafulexaza.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/25422881508.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nifafu.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166b4da9bc---4575496157.pdfIn PDF document text
    • https://blokhol.com/upload/files/maveberow.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/50104352236.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160907010aa323---92942856420.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_off0000bb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 11024 bytes
SHA-256: fbd94df5f5c44382900ada9918397705d63f212acf4ea64c58b8877b0187b3db
font_01_sfnt_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16836 bytes
SHA-256: 7e3268bad781b0360f5f8c04bc24965aa9acc3263a7617226ffd3f59b2e28e8a
font_02_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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