Malicious PDF — malware analysis report

Static analysis result for SHA-256 8465c1fa8978c7c9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 09:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0cb75121ecfa52a08245fa6a9a450ff2 SHA-1: 9eaff4bc37bde275897239254eebd740006a20d4 SHA-256: 8465c1fa8978c7c98df1bb587408cd16f9674306321d2f627ac456cb9b7fff4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to further stages of infection.

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 http://shamayachts.com/upload/file/33025713474.pdf In PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/26684389475.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/povukuvades.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/farufiseritorodeverid.pdfIn PDF document text
    • https://afayl.com/userfiles/file/12460960061.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902151049956.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140914066b65---30365583925.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/kutemizadonum.pdfIn PDF document text
    • https://iword.de/userfiles/file/47508091438.pdfIn PDF document text
    • http://photojet.net/userfiles/file/bojekotusilafosi.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210911161641.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/28186604148.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/35427503166.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161396c45178ee---zofeza.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/14dad767fb774114ca5a9fdc41de2695/solowatukarujufedukil.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/kupuxezusok.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/wojolarugabiwumimerodeweg.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/xinijekawetam.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/guxezolerutixorefodusugog.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109121053449918.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/garajudodopidunu.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/petededinomenanajus.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143d7482f3df---84994913008.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/98493949993.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9vh9ncfe63112qfp77s7257df3/28729932792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+apk+download+oldPDF 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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 18056 bytes
SHA-256: 841fab442e0a5bd54827e2dcdeb791c58ae060945703364951fcf0737ec54e59
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 10432 bytes
SHA-256: 66c9c832b753044f336705bf16c84172b2c2a20574c9a1fce3d91e5041ab986f
font_02_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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