Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaee555f961949e…

MALICIOUS

PDF

95.2 KB Created: 2021-08-01 14:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2b85c71b89d09131cb670ae29ad97327 SHA-1: a1ac63d2296e7ae00a58afdf6b95ee9ee74dbf6e SHA-256: aaaee555f961949e4be527817221b14a0b412e9e98a8cd44240b74badc25f3c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=memorias+de+un+amigo+imaginario+libro+completo+pdf PDF link annotation
    • http://tscyw.net/userfiles/file/20210719200100_uwpxml.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/0a471c9eba60853328af04430b4e922c/xibup.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/50066155980.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pm0psusjd5vt93g72s3truj8j6/tazenuwepagokitejezupaki.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608786f83280d---5343576276.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/9673776a9d99b7bec6c91f7cf397862a/1132724400.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/jolajenokajo.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ggpe5fugv33rr3i21vd1krqjkn/niginetex.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//fusemuwovasinobi.pdfIn PDF document text
    • http://watch62.ru/files/files/65580763283.pdfIn PDF document text
    • http://cpils.com/userfiles/file/49864415948.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f3d7d6ea---50262381869.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/tarogomazamidaxesamawo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8552a747---wokixivirulafululoza.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b6e631a7811b3eb35c5a60cd9fa4e6ce/gubutesonifadawava.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/ruvupewodutovezebesemim.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/11469487029.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/93ced959ea4f425738311032bea26a0b/59587936523.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210528_61FBA57CF37B0A01.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02f46ccf6---72186872427.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/51573004573.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/dedivev.pdfIn PDF document text
    • https://actor-conseil.com/files/file/nedozevosowisuge.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/sebotorotizanorazasuxuf.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 11196 bytes
SHA-256: e3a9ad21dcc1cb19baeabdf20c788cdb7ae40225c166ca43650e09099fdea49c
font_01_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 16464 bytes
SHA-256: 59ac03bcfe07212772227ebea28e9f4a5b0a478a360e18b01d8acc39b00f826b
font_03_sfnt_off00013b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B50 18880 bytes
SHA-256: 675450cc6b0ebe986a40f5093852b96644ec3cac4c515607a1408b41f00f4177

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