Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad128f6c9adfb108…

MALICIOUS

PDF

83.9 KB Created: 2021-10-22 09:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac1ffcba4717a9f64d390c7e692fd1da SHA-1: 98bb9c0e4a40febb62c7c81e8a8b9726790de4fe SHA-256: ad128f6c9adfb108b333ea5c1bbef29ecbb7f45e6f1a8999fabdd560fc006c33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://garglob.ru/uplcv?utm_term=korea+research+institute+of+bioscience+and+biotechnology PDF link annotation
    • http://alltechsro.cz/files/15847202693.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/11638174457.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/19180612254.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910125656.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616f85e8598fd---nemapikoxaduropodiz.pdfIn PDF document text
    • http://wwstationery.com/files/file/67274064653.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/banikejafonodop.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/vuvumojavuwamosiki.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/51285715875.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/nuvogepubozerogup.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/febudosiridikugerunixem.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/samulela.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/35729680928.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/jidom.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/39746733365.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/dusunetagojoxi.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/vosefadelepezaximibe.pdfIn PDF document text
    • http://cocoal.com/uploads/file/bevuvefuzapelawevegup.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a83118b1aa---tovipibow.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/25754472778.pdfIn PDF document text
    • http://ip-kamery.cz/files/file/voboj.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161698ed65591c---kukomirepukomubuluwupen.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/melurepelo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145933de5d77---tadopu.pdfIn PDF document text
    • http://opsir.eu/files/file/26533601960.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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 20140 bytes
SHA-256: 51c71f9810f05ec3e11740b4fa569dff341a259a333854e8504ee28561fa4fe7
font_02_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 11100 bytes
SHA-256: 08c013bc7bde31ba8e766862fc5b1f65789928d15e7cdc2cd4729df056913df9

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