Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bfa6a99178ae6e…

MALICIOUS

PDF

119.3 KB Created: 2021-09-04 23:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78bc0bbfc0907c7b800846df6dcde150 SHA-1: 0e149cdc7e7d59f39bf811d9e657b19bb494b1df SHA-256: 91bfa6a99178ae6eee8bd8cf4996413d0f2ec733799a413f21be2ebd60954a66
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to domains identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://lamelove-zakryti.cz/userfiles/file/59984472164.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/15659917411.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/vokipatopivepifoz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/03f9c9ecbc442cb0f3f0a4a2f4bf5f67/votolufitonararipes.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210602233511700.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/5ur9vn7mtgghvckg6dfubpek7i/17793369933.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/78078725127.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/78879226872.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/61337413818.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/66494836335.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba7fb20b7c---95658860065.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d0c41512---73975908160.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/wupolerisejiresupo.pdfIn PDF document text
    • http://health-bridge.in/upload/file/28456862663.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/mumokulitumedibon.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/89274568333.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/7g7143pt8poiagqna32h3j8f97/najabunikosakar.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/26069765512.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/nemuvosajejaxupitupod.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t1ffldjvbha8e71uqm2inrlc04/11480877724.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a523bea2c1d---18408439636.pdfIn PDF document text
    • https://plasy.com/uploads/file/47272043855.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b5f19df89603943a0a54da74c99f4a29/pudil.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/tezonopadog.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/20650adaa9980ae666bc5c626fdbc608/razeda.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088e1a672aa4---jevoxagepobeximik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hodograph+method+pdfPDF 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_off00016eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000186dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186DC 18548 bytes
SHA-256: 02c76c0b77b94f5ebff128bcc0a1451aa55b2de1245fbc7e53cfef3ff0dd7eb5
font_02_sfnt_off0001b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B735 10528 bytes
SHA-256: 48c3f7c49148af7f8dbf6a0525c7b16ddd9ef51ee6b5efaa2f8348aed28124ff

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