Malicious PDF — malware analysis report

Static analysis result for SHA-256 041f10f507e82fb4…

MALICIOUS

PDF

77.5 KB Created: 2021-08-31 20:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac258407a96f5f3b01c0f0e172534084 SHA-1: 7fbc00e34cab4e12cfb73f9f6d54703df0981d20 SHA-256: 041f10f507e82fb4c98f000efff284839275f0f63504f1f628b5bedce254b608
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to numerous external domains. The presence of embedded JavaScript suggests potential for malicious code execution, while the link farm indicates an attempt to redirect users to external sites, likely for phishing or further malware delivery. The URLs extracted are diverse and hosted on various domains, some of which appear to be compromised.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://smidgel.ru/uplcv?utm_term=yuka+roll+and+pho+old+peachtree PDF link annotation
    • http://digitalpolicycouncil.com/imagenes/file/40408928753.pdfIn PDF document text
    • https://ms02bet.com/contents//files/20899187940.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/kuvemidima.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6f59505b9ec38603298359525fe6d51f/merazasugafeguwoxeju.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/xitenutikagutalibiruweju.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/dipumavoxuxuli.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/65493381644.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/78672601544.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/remudenejoregob.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/nafifobudogiremulixupil.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/voroso.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb6c745758---nugidexudetabipejuluvodo.pdfIn PDF document text
    • https://emprenderem.cl/files/retawakevusozelezunisav.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084622879287---870652871.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa387ad0d81---lazisagukuve.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a97da95b32e---gabonogatupenixosiwawevar.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/rirugofuwatube.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210721080801.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mvinvtoqmhc2qqc85hsiihe6m8/91120731436.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/gusufa.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/nixexilatanosoxepo.pdfIn PDF document text
    • http://usmleworkout.com/files/file/zolizebiwarug.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb01cbf7c2---fuxup.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/kuwugupaw.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_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 17804 bytes
SHA-256: c978ae674c1f36cf5b6d1ac8de51c8b0d4f4be631c11825fdbaa7b9ab613a174
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10528 bytes
SHA-256: adad19ecbf9d63de2d6dfdb7efde80ee0b9f02e408e64b3e01c647383e70946d

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