Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ae27935b2a7de7…

MALICIOUS

PDF

73.8 KB Created: 2021-09-27 03:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9857bec3d9991993e027fde4893f624b SHA-1: a5c59c2e7b2bc757dc2fe8bd58fe5e3b6ece6644 SHA-256: d7ae27935b2a7de7bdae480181ee1b2c771151f8239e37b8dd46def3a124834e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to external PDF files hosted on various domains. Heuristics indicate a 'link farm' pattern, with some links pointing to compromised WordPress uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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.ezmoving.com/file/wegenilav.pdf In PDF document text
    • http://danangsculpture.com/uploads/image/files/lakebisov.pdfIn PDF document text
    • https://pratham.one/file/43988002578.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/67367776930.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///variz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f40a70a3f4---96252057663.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/moteluzepo.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/66836867740.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/mowawitidop.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/27224600360.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3d9c89dd917d48baa8bfe46baa78b445/lejedinumenotinuluf.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/gududexojelovonudi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee6f31709---54115908396.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/65308028324.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vixidizeg.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/wopebuderozuka.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/32000081194.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/xikirita.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/989538f81fcfc309414a401ed6e26575/45052853856.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/pepawagoduzurirepukuwevot.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/12030418558.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/rumomegasofijopipu.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/25388887763.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/61933617348.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/nilipujerapagipememitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+run+android+apps+on+linuxPDF 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_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 18336 bytes
SHA-256: f59623ca0b0bb865926434e67bf174428accc631e70fd7b18fb83ac726bdc678
font_01_sfnt_off0000e94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94A 10532 bytes
SHA-256: f7e7d3568ce5acc0b28d13ff4c5042369a54c8ea3b7dc46616ac2bbee6961ff0
font_02_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1