Malicious PDF — malware analysis report

Static analysis result for SHA-256 239e284c9fe5e12f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 01:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ae475f4b68b4d776f85c99ff625122e SHA-1: 19330c45a282828f09bcf145617e8c43ad98657a SHA-256: 239e284c9fe5e12f24b8aeccad508a5c2868368d434848d6bab78f9a09466b54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farm patterns, indicating a phishing or redirection attempt. The presence of a URL with 'mobile cleaner update for android' suggests a lure to trick users into downloading malicious software or visiting a compromised site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=mobile+cleaner+update+for+android PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c3d4e2cb---62583975617.pdfIn PDF document text
    • https://melz-feu.ru/upload/40801288037.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/76778098635.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nikobubigezenabadiduj.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/jesebonok.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/60798964900.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/takojemivirodak.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/65517853925.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/47716986456.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/01f4ea01f15c8d4142575e81e2c07e0a/84096010141.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/wexitoxiwekexunuvomela.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/sixewukujuwogeb.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/losoxubunu.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/sutorewifozexabusetaf.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/71261507143.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/50259030817.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wenawilox.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/vifezufugimodadewemat.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4eb8d5c8---rovovilurapevuderevawo.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/pudob.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/67961663340.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138577fabddb---bekegezefanowixizog.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/dixixijofa.pdfIn PDF document text
    • http://anninh247.info/upload/files/magowuginumuwojo.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_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10676 bytes
SHA-256: 58cf693bd8cf49ecc9f1b1c6021d8c8c7b32b4eafcfbb7ab0c313fe77c8f72f9
font_02_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 16620 bytes
SHA-256: cf2e60757e376be964020dc734a33a198a3304d8511d45b1c36505f33963c44c

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