Malicious PDF — malware analysis report

Static analysis result for SHA-256 5159e452bea1df06…

MALICIOUS

PDF

87.0 KB Created: 2021-06-10 03:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c2145583167535a67bedaafdaaef7cfd SHA-1: f1a791d55d92b51e0fde763f0abdb5929422c14f SHA-256: 5159e452bea1df062456a6d6ccf9ca5c6ad9ebe5fa051e8f2aeced062706d3c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=ashtanga+hridayam+sharira+sthana+pdf+free+download PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/k99cdl451ekifl5usj71fa2b2v/tebefupakoxute.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/80656525378.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d5476ca5e---5553814769.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pigevewazenimewibomopup.pdfIn PDF document text
    • http://yongqingtech.com/d/files/xakekasurozub.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087fabc0beba---xisamunilululep.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/munutixeloxil.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/10sdh5mmm2dorrmgurir7k508e/sadazogapufipiveru.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/kt9k8k6siaroqhlerujb5o3vf3/kobunorubolipovi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/vesemodol.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/97690375377.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/61723817688.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/40831883812.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16085a92317c57---soritaranojomu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e6656c6d078acccfab4b6f84b9166632/27900972900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5428 bytes
SHA-256: adc59e1b720ffea28fee8e38cb37abd0d57042b80ff271fbfed89e41a1edbb00
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 11540 bytes
SHA-256: 8e33267e4a529ae9ca6486c1c8ecea63a40368c28bb6e1e0befcbf25031ec37b
font_02_sfnt_off00012d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D34 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
font_03_sfnt_off00013b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 4664 bytes
SHA-256: 8f046ab3f66f1f4d9dc9e7161085e4e3313299617b660e709580f4e9a999aa1d

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