Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5c1241e65007e0…

MALICIOUS

PDF

75.6 KB Created: 2021-09-23 04:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7196e8e541f5384dd15504eb146e151 SHA-1: a4d7872a5ae16b0fb6e73568f5d263743d0b66fc SHA-256: cf5c1241e65007e06a566c385c85e37ab5d34a5e2a7b895f7cc8365394f5926b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=install+preeti+font+in+android PDF link annotation
    • http://suchanekstomatolog.pl/files/file/jiwikanesed.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/85172336390.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/97242702888.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/bugubewegunode.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/gisofuzekamiriwivutipu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161401c65419fb---17450209518.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/82578200499.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c70ce593e1---dineverub.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ad2dac06---3138008725.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/fejelowefasatij.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/71847251296.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/kafumovidigigileni.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/60850311144.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139c237c8b87---13682761468.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/24581637008.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/45235720774.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/guvosogosofurefikapoz.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/jikogukuwifoko.pdfIn PDF document text
    • https://projetovm.com/uploads/files/94058485119.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/48926152164.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/musawonu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141651c9f989---28541671563.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/13964281528.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/bages.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/zereviwakexaj.pdfIn PDF document text
    • https://asiapharma.la/files/files/bikemogakeb.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_off0000c0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 10440 bytes
SHA-256: d546cb3266d7d4b61ba0b6d8a91226bc40e2ddc40a524565f0474c113b1da2f8
font_02_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 18820 bytes
SHA-256: b16daca4dc4cfed0d79d8e8ca0dc7b908aa74796e8a7ef4243206823c2b3f6dc

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