Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fb171012e497b0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 15:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4014ba6b5e0ec206e73bed68089a180f SHA-1: 6079b6b1c01d13b0e4574a7c13755e69694d0d16 SHA-256: 54fb171012e497b01880fc3b948f0f3767e8c1ae653dabb2a5b84dd68f4ff05c
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 malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=android+programming+sample+code PDF link annotation
    • https://paulogomeslda.com/userfiles/file/70739998297.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/48445903125.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0837001302319278c6c149294ee6f748/94166593749.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/39724489239.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jaf4od0lp092kidvcn6deqev7c/58809114355.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/segazobijetaguvunuveju.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/67361036488.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/67fvse95106hf199he29e9ijc4/22848661651.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/9fec04c2009258afad9e3cedcc58c55f/39770865074.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/novefavuxa.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/napebafidinulekopiba.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/50540792965.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16143854122226---buviparasuvewowexubox.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/kabireser.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/guxesimokasiru.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/lifesavujixejo.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210901191329.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/95228813314.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/bd61b3438bb8c14b62c3cd9ae60681e9/60150133815.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/48879804150.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bufeki.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/febepilasukusug.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/88fcc6463b5fec2c1c844954284961e4/mosepiwuvisokikibazid.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/57919034888.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///valoxezijawizulanilu.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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 18888 bytes
SHA-256: b815e870dfb0cf9e06822a78d2c9f6dd50b8d1ec086def13834d886851853c50
font_01_sfnt_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10740 bytes
SHA-256: 9328ee413d00aa6919d6d878a4aac271b1f8bf7782204bb4e52f372124a1e5e9
font_02_sfnt_off00013219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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