Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bb761dd4ff1cd6…

MALICIOUS

PDF

69.9 KB Created: 2021-10-02 11:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8332d3c0c765d85554ada2d76effc5c8 SHA-1: 2d1d7d37bf709db11f25965f59badba79b6f12ae SHA-256: 41bb761dd4ff1cd6bbbb36042207afade580eafa96ef35e87871930820608c5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of embedded JavaScript suggests it is used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gazukarijibesiwoka.pdf In PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/27403290758.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613727a19382a---87659532754.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/93357096159.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/pimelipixuzo.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/88380221738.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500d808fcc9---81597922413.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/wufineditetekuni.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/17742846789.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613793429ad11---66594435445.pdfIn PDF document text
    • http://ipllaser.in/uploads/wenawepubolenajuva.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/nuxexipetu.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/kagagefexuxaz.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/dadonagabe.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901115118.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/romowasirageve.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/64412104293.pdfIn PDF document text
    • http://gaudi.tw/upload/files/98485762874.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c7557df92---89447905081.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/zafokojinijepunovodeviku.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/49963310628.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/11572643065.pdfIn PDF document text
    • http://dmkert.hu/files/file/77750586916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=average+canadian+family+incomePDF 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_off0000b25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25E 15432 bytes
SHA-256: 25c3895de17199a4ab01eb7157724200b5f1af790bd745e63a53d24d6a24c22a
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 10712 bytes
SHA-256: aaf01c25a39b4d4f16fec7f970bd150273e7e31a52906dd8d9b1cd561b35e75f
font_02_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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