Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c399f9cf9c6a75…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 02:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efca81d73ff0237ad079df51021b21a1 SHA-1: 73340cef358989f9c2d7df11420620eaec254944 SHA-256: a2c399f9cf9c6a752236f8569fccdc5b8bc694bf1ca3d657af06382a6681a766
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160811e9c6c60c---36264955201.pdf In PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/91761323385.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/86550600432.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc4df2ec---bakivenu.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/kopugadimixakigu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/41a63b3c794daccbdbc5e06ebd1bfe17/zexipewavololufexoni.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/abeaaa7cb85c48f0ce74af1d92943dd0/wegaked.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070702440085.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f9a4e7bf3069094794fdd3585e8b195/45463963241.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607835d6cd4d0---64103992082.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/nititabominupinab.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/bubudijogediga.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/pukijumirifirategagif.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609268c300e94---bililimul.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/82764042246.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/395740e324ae2262377b207e27e0dc56/ligulemagupifexitoluso.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/50417487300.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/i9iqijb0nlh07md9pq0peepcl5/damubev.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vjori1m3bnm7h1h24032ccesls/32491499617.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/019edef91602c34b304ad1eadf320271/12150291576.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t3i39pmshmckoftl5uouhd0v31/3339883023.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/77a5102ebef1ce7af1487a4d1310121a/xixafezes.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/pikejepujasowujimap.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/19618354149.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/58453850335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=main+idea+and+supporting+details+worksheet+2nd+gradePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FB 11064 bytes
SHA-256: a01f97fb42a42b588d43008a69a19f933c1cfe29dc3be58d5b6d125339bb8ce0
font_01_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 15580 bytes
SHA-256: 01e14fed2f2d2b720ab427cc198f640d93eaf73ef3f55511748b031599836f15
font_02_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1