Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e06e414e5f481a…

MALICIOUS

PDF

77.3 KB Created: 2021-09-05 01:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63cdbb15d61780da8b9b7199922f2e87 SHA-1: 8d2e0d13027e8e85c701e9f2425306292d6def5a SHA-256: 34e06e414e5f481ade16c0a5cabf0128d32dbce1b44aa13a7d840dfd7bb2cfbb
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution vector. The ML classifier and ClamAV also identified it as malicious. The numerous extracted URLs, many pointing to compromised CMS upload directories, reinforce the conclusion that this document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://legyenegyjonapod.hu/userfiles/files/zefevigowinalurakanaxib.pdf In PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce11d08ae0---pusuri.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/18397011018.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/korm7o8829i2ju9iahg36jbmn1/mumebedaba.pdfIn PDF document text
    • https://o-dance.com/upload/files/kupodapu.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/xetuwotojagunajotakaropop.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092814c9f4af---91942449808.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9605aa5f61---3723890786.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182d2131155---vatawovubeviroso.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b4e458ba4bbe832d1ac6930ee5849d5/temewavukijizotepez.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ov36chtjkcrl8api7psgmu30f1/98410258317.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/zigutivu.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/lemofotebovifuv.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/tigobisuligakevupe.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/kefim.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/sidaxorozasige.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/xaxobixepunonibu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ac30521e---94891963306.pdfIn PDF document text
    • https://esz.jp/img/editor/files/sasezasofotafunize.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/74199589656.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610be38a8f4d0---wisitewojabirewuwitu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/wokutavako.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/32556713467.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e1d29aba9b43cfdec32c1f09854696fe/tikasakanezonuge.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c43c86eee---23827201853.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105ad196d81b---54243410756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=2004+gmc+yukon+xl+owners+manualPDF 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_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 15736 bytes
SHA-256: 5c608e768ba1bd8fca76bf1c3e59cd94e54a857613bf7d929b294a574c1c2429
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 11100 bytes
SHA-256: 3d1857ec3ed09f16912f3c93b3c6299d2555ae6286ef032368a59f67aea81f6d
font_02_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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