Malicious PDF — malware analysis report

Static analysis result for SHA-256 db68adc7cca1c04f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 14:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 8f188d7415d42ce85a7331d01c886746 SHA-1: cc3788e13ad2e22907ce4790b0a3390d22ef2ccd SHA-256: db68adc7cca1c04fade393fcd2bfc35935f39cc0f1e7c8605d0fc47e21b8b153
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://garglob.ru/uplcv?utm_term=kuwait+iraq+war+pdf PDF link annotation
    • http://thsport.dk/ckfinder/userfiles/files/fititovixagirekixopusivar.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/25617855088.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5105006cf---xadukuwozimolafimuvolaso.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/da455c50b4333b65b20537ac2917602e/33807068987.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/nawamorigokeda.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/81594574358.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d13a101a---90373231477.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/aa9st5sj0p03j6hv005otgm4n0/lopexogux.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021061708035182.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/23247588356.pdfIn PDF document text
    • http://szwygs.com/upload/rezafavedixosisipeto.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/76456325137.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/vixojisiwojini.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ehrvob5jkm83cfdomklm6f9b70/22828888343.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/ffa5785c64ca7a5360b60b420d829112/wokaped.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/303b32776b40a426891b6abc087fbea4/bidurikozazokiniroxogovu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4326b162f145536b2691477742e5c0a1/1158078502.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ba99209f1b1---bamoko.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/narezi.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/57945524765.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/651452e84e1901cc35e82d1ec33b744e/43388235134.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0bce7f682---fawafuxosugumu.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9912639d---23208710425.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_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 10244 bytes
SHA-256: d13c055e61d68a8f630aa2d63b1763dd2fb4f41763927f7b01cea8f6f9cfdb57
font_01_sfnt_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 18028 bytes
SHA-256: 44213b7e9a2ee7e05f6865349194a0c7abbd4817f179ff9c6ef286a85c921aca
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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