Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3578b2a0c3c7e3a…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 12:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 676ea89ee4ae80b82b740ae1932ebf09 SHA-1: afa6ea472a9e6197f05001ace97903569133a242 SHA-256: e3578b2a0c3c7e3a17126cebe89db10265537ebca623f6cfdbc82a06206706ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=occupation+and+workplace+worksheet+pdf PDF link annotation
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5054a4b0f---68388936313.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/38863548594.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d12aa92c07---mujop.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8bffdf0b6---4473103386.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/31089656992.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2a64c6eaf551a4c81d9cef3468e7eb2d/xujaguved.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19096760713.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/53428750823.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160f81610581aa---7645645168.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/0alptplck0nd7mq5c1fjb0n1o3/62091535080.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805958821bc---69089639446.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/17188713968.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/defakevepinatupepakapanem.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/36840244499.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/99840933128.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/69117941906.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/29972127383.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/1211993562.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/majoduwusisalede.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608759dd639c6---jasan.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/78657844442.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/99270770104.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/ranudokuwit.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_off0000c8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 11020 bytes
SHA-256: 0e68b862fe61c0c31df3e2a001b55d786233ccf16c3c23e5111f4d73065772e0
font_02_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 18340 bytes
SHA-256: 18be1c10948e5c459f6f00c1e12fe86874076b2985fe72248839cbe18302ec6b

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