Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a24dc97f64fe39…

MALICIOUS

PDF

79.3 KB Created: 2021-07-26 17:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b767926548b92cb1a10ac0a7c2dd5057 SHA-1: 6f13e0e81b98306e7208cb412920bf20f8d9e8b2 SHA-256: 79a24dc97f64fe397b244fffc93d78e873c6d45178ee6c94f1a5e068639cf132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs hosted on compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/74d1d1af879c6fc9490e379d8d9838bf/zajoduwugazofus.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/cb33897f35581940bdf97fdcd792be67/33024200178.pdfIn PDF document text
    • http://intergeored.com/upload/File/mesokota.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/25540106915.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc3112228---41098600826.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b026fcf68b---27556579638.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/67366401179.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0277330cc3---sibafoliwuwajirefofovod.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/saxerupimigitoto.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9bec46d1---bokizawigakileteko.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162247794836.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/zabinuselowukomaviva.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/bebosulexenutip.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/19043b1cfebe313cf4348b297d6899ba/76666600931.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://nutronicltd.com/userfiles/file/lapaxorejegegutaba.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/96684438005.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/dewefirederozoz.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/sivopaxobuvuwiludifotakex.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608934e316b4e---pomelajo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/fubeb.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/kobagodoroziz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098350e0ff26---kusulifagaze.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jho35ncmcp6tch0uesjs950rm1/zaxab.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b756e6d79b---42219445167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=citra+mmj+emulator+apk+free+downloadPDF 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_off0000d4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE2 15976 bytes
SHA-256: 00807734a1fd4210f3ae1d8bc2f6043f1bbf729f4c585dd2f1cf52c75349ca57
font_02_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 10928 bytes
SHA-256: 67cfd217d8800995e6d3490caa3497b0d2b037bc4aa49ce6ff4a6c524f6805da