Malicious PDF — malware analysis report

Static analysis result for SHA-256 93743499776ffab4…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 18:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d54c3cd3509bc768ca5c4797a4a250b2 SHA-1: feff0e8c04295e9d14de1372f1b0c5751b5279fe SHA-256: 93743499776ffab4b4b09f4e897f2c6255351ed9954c87520837216571ffd792
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=singing+exercises+for+beginners+pdf PDF link annotation
    • http://fratellilongoni.com/userfiles/files/rupegenowota.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082704a7f50b---47074497611.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-8-29/20210829045944848075.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/vakavedebi.pdfIn PDF document text
    • http://storemisr.com/uploads/files/61052648141.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bah6tmuvtcpnn8psg41b3a9uv4/65384406435.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/1980599568.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/juwopujowiwupimatu.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/mirebuza.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tjktdarj0018c9svdld4mn6qc6/burivopam.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/83360705425.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1db545cf0---zaxolugoli.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/df0073342672746dd50c55bd46c6b723/duxalomobitejuwusipuwofe.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/1248309670.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/lumirebirubulunu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8cc10f30eb507c413959412ce5a9b8b4/pepalesul.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/wopikedipajeluvevunuw.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/15975373338.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/xerurimamixedirolefili.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/87585371224.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/varosa.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/rivowejixo.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/18877328136.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae069ae6cbf---76037346447.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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 17432 bytes
SHA-256: 9ab0e049e4abaa5abe98dd5f92736903ec195fd18fc1830d6efdaeceda56dd22
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001168d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168D 10808 bytes
SHA-256: 274f201acb300e13780069e4d6b63317fb531d5fa0d12407962fab0333108f3d

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