Malicious PDF — malware analysis report

Static analysis result for SHA-256 e900135ad55246bd…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 06:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 80a39a1982539e96e7588d09578ad128 SHA-1: 2b6c17a2249eb0dcaea8f82a682655c86f6c319d SHA-256: e900135ad55246bd5a737f6bc886ad309743351ab175d0c9be590f48fe212d09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a ML classifier and ClamAV as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://shriadinathbank.com/uploads/1327237655.pdf In PDF document text
    • http://elcampoeco.org/FCKeditor/file/9834305833.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a8ad62a6---22890041982.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5c4d0988---74414531296.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/xixidawirapa.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/89278034408.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/90445072003.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/sibezefepu.pdfIn PDF document text
    • http://potlista.com/file/files/11628275098.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/dasexukobitu.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/fikazud.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/80503698619.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/30737319139.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/wowifaloduziro.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/47698684916.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/59985d7da04c0fc6b244716a9a88758c/20964324044.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///92526427018.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/85939286257.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031145155856.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/sogewasozokegexaxenifafuf.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/53610920009.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aeae154ff---64978199728.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/xikekodexuni.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9551edc3---mazudobew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=american+cinema+american+culture+john+belton+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_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 17904 bytes
SHA-256: 4a3096714f044d11b8de7b82978c54b3fa92ae3eb067db1fbed0b8434c6cae0b
font_01_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 11068 bytes
SHA-256: 0c8fc437deeef5134e6bec96449932cc237b9925b6382463ecdbd84dd76c8b6f
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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