Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3df5053c40636b6…

MALICIOUS

PDF

75.3 KB Created: 2021-07-03 10:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3416e15d46b1e1ac80c0a1e540c5d1fb SHA-1: 778afedbfecc4da57037894409bd023e1e646d5b SHA-256: f3df5053c40636b61fb6f48ea3a0331106e74343387b0090ac34ee45ec180f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous distinct hosts, many of which are compromised WordPress uploads or disposable domains. The primary goal appears to be directing traffic to potentially malicious sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nicosiacaffe.it/file/23850736049.pdf
    • http://www.bandungmesin.com/file/3107677058.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c03c1abfc7b1275a4d75794c86c8ee18/votakefi.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4bb71a000---73401937740.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df996612103---morusazibilubajamiwum.pdf
    • http://notariocprietoa.com/notaria/documentos/files/76780198299.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d26c85c5---pexovozunoxa.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3a987c3e68f89c521f4502fe7fec6cb7/jufanowipaveziru.pdf
    • http://j-club.eu/userfiles/file/guxazamoz.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b257ab962---kirinojarewoba.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29139444b---5941918888.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/21528634403.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/6d271d5ed90162266e7b04ae92b2e309/dixufi.pdf
    • http://4seasonstours.in/userfiles/file/gajirusi.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/air9o5299ppgk4b7ptam96j8j5/28374443956.pdf
    • http://zonwering-nederland.com/ckfinder/userfiles/files/9003428542.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/70176909632.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04f7d3ecf3---29475474285.pdf
    • http://advicetao.eu/pictures/file/razuninepoworufexikoneg.pdf
    • http://thevelascofamily.com/clients/11614/File/11200427371.pdf
    • http://elcampoeco.org/FCKeditor/file/zidajunaxux.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/kuvuwizudi.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/53620f099be53d6e117e9c6f91ae8e25/88022367414.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=photosynthesis+reading+comprehension+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2e4.bin
114d3b800d8a1bbd54bf3bcb8898f7c0f8c23f4b098f631df4c36d5e417f1b47
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E4 16660 bytes
font_01_sfnt_off0000edfb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 16792 bytes
font_02_sfnt_off00010612.bin
10f53a56a31a3004a6ed2873916b38bcfc4e416d601dcfe926519fa2b33a94e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 11136 bytes