Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d82f66cc6de7308…

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 00:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ec35c0a114a1c9bbd35e07614e3bb5a SHA-1: 383a77ae9f2346ba92c86718ae4f0c72b0f4cf87 SHA-256: 4d82f66cc6de7308a774f4c30ced1e99b4396f535602f4e44286b7ebc57b8540
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also hosts a link farm pointing to numerous PDF files on various domains, many of which appear to be compromised WordPress sites. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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
  • 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://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/vadegulesig.pdf In PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/49929614200.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b6919da3c---64883061222.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/nikewo.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16089d21403021---85054818837.pdfIn PDF document text
    • http://viettruss.com/upload/file/zapozukazomevaditin.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/raxifomipovoratijoj.pdfIn PDF document text
    • https://premium-house.uz/images/file/wuluvenepi.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/kejizukalisububedopoxore.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/98560763588.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/desamibitig.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6b975a48828be0d84a2dfb021c10770c/87791608463.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/36335862453.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/dunerezam.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/56476hnul2ee9k8okjjdi8nbb1/welorerikafofezasibefiz.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/dobajefejoxanakulijawe.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210712_0BB45CF31312DFE3.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/kekudolakom.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/93d25ecc52b67c21e338a5bc24ed3b5c/zididozajuvin.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/rivugufagola.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b595a02a3ec---salavufibal.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/mojis.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210803_8E8B4905A545F20B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=delusion+of+deathPDF 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_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 18948 bytes
SHA-256: 4b5710f22c909f30752066d21d50612931508dd0dbf4d4c95befb11ade6855da
font_01_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 10452 bytes
SHA-256: 83a77a93650a4e160dd6854ee02850e7031ce129cc9deb0bd313d02cdbfee2ba