Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df56dc65ba08e15…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 02:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3eedce5362b3e2b9954c7a005862b06c SHA-1: c1e2913871712b31b6fa1443e0c5ca1b8ade9645 SHA-256: 3df56dc65ba08e15a5fe3524f1ac4fb32c42dc8a97daa0cb387fca92a9584bc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing or trojan variant. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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
  • 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://wastran.ru/uplcv?utm_term=justice+league+gods+and+monsters+kisscartoon PDF link annotation
    • http://dulichtantai.com/files/uploaded/files/32304630848.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/garakejitul.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330d0c3415d---bulodujuz.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/fusarebaregutikuda.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/40794225971.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/27429247619.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/wonebokoxigexofegu.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/doboserofutixolovejoduba.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/6400661980.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b73a34599d---zapisonerum.pdfIn PDF document text
    • http://artediapharma.com/upload/files/38204610130.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913103052_drdupx.pdfIn PDF document text
    • http://bdsductri.com/upload/files/32978191653.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/44738345286.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/62697131113.pdfIn PDF document text
    • http://schubert-hh.de/image/file/75165929693.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/3440338362.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/73685573670.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d03f3ef1---71300109111.pdfIn PDF document text
    • http://koala-al.com/d/files/jepezutozovak.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/85238093325.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/45070350804.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/97675334727.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lhb19vnqr8fp1438rbkgojjqv7/62158665777.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 10896 bytes
SHA-256: 965bd9c5bb1c7e8c75d8d0cb91650dd0ef7cfbc06bba6a5d701b801d1ef6509a
font_01_sfnt_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 15352 bytes
SHA-256: b65513976bf85b746894d07fa51d05f3abb05874fd51b110bdf9587b9b538ffc
font_02_sfnt_off0000f265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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