Malicious PDF — malware analysis report

Static analysis result for SHA-256 104e4a2b5065d94a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 04:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc31c394960c7d36e792d4bb29bded5e SHA-1: 02bc6dea79b3b8476d4a62fde913f677bfe1ca67 SHA-256: 104e4a2b5065d94a940407aa437df63ab04f570e68147ab3190593898b8b76bd
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links are likely used to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5097

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://laborke.ru/uplcv?utm_term=literature+review+on+social+media+marketing+pdf PDF link annotation
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/i3k3f4i1i10da1ptuq0auan941/jajotexofeli.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/63cdce9aac45920b3d6cdc39b2dbaee5/87410139858.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/kupidadawebegobiwunulebis.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6708ce8099ab8532be0663ab226d8c45/rudit.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4524cf13c---62769909752.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/raderodibomokizevimip.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97d8dc8f6---68038335573.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/vh5ulq311sjuc914v84bgs6b9d/4032206016.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/sijuwaditubidibotosaped.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/96362394073.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fb784bb38---50664420844.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/fifaxarotibanopor.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/97517d26bff2c707528d94af4d663a10/33207669632.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de11d54132c---60495790417.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d049ac6845b020b360a15a552672b40d/fesodabelixunom.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/3874421133.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/64015454886.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/45056313046.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/radewokididos.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/firajosabelanibopa.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/ziribodonewisimumiw.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zinekamufupepobik.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 11264 bytes
SHA-256: 093134f4d4106af473369d69769e404425377ea6c2c36a850c04e25b7ac6ae81
font_01_sfnt_off0001165e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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