Malicious PDF — malware analysis report

Static analysis result for SHA-256 1311867f1526fb22…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 13:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 653569ff4789060dbe9fbf084865cafb SHA-1: de2bd37dd77034842d292bc628f8eeddd81e3afa SHA-256: 1311867f1526fb229629b6f94282f8b9382fd2ce29f619024412adcdc162874e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URI heuristics and link farm indicators points towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://dejede.com/userfiles/file/livaweriwiwuzenufal.pdf In PDF document text
    • http://improntediteatro.it/userfiles/files/pafixoraj.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/43544553640.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/49398072267.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/26222727741.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c910206b74---18377348859.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/fidifopegaraxajivawe.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/39999636589.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109150615408207.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/duguveboxovuruduto.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/58ba71d2f928741d08fc7f648ae29315/43396602663.pdfIn PDF document text
    • http://ha-sine.com/d/files/bavijowuri.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/8138919156.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/futimerufamijune.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/kavifurinakuro.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410c70b808e---guwijatakuwulutizukave.pdfIn PDF document text
    • https://techlan.pl/files/file/31461624177.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gnhsbpors6l74rbi5o67idf6q8/8454343907.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b77271207---jumijufaboxagivomidi.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/39228589778.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/37429544335.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/79895212605.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/21152787766.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091114004664.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/reloxeretipoju.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/8379664311.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/jefokexobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=earn+robux+by+doing+offersPDF 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_off0000b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 15856 bytes
SHA-256: 425ec1fd413fe91784177b7dfdfd15afe99080c8b0628571bd8a799a9a56eeb9
font_01_sfnt_off0000e04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04C 10824 bytes
SHA-256: e60358a79e02b0b46704830d25ab81312fe08c6ae6dbba5690c16af0698253ab
font_02_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1