Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb878eb1e466b09…

MALICIOUS

PDF

68.2 KB Created: 2021-09-08 06:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa72d6b1af583a3c3ad05a35aaa684e8 SHA-1: 95ae28c4c1f65c6b1ada8f3745f48a2465b94986 SHA-256: fdb878eb1e466b094bd255e25917cafaf5eee3bb08b7174b867d9985e856b293
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e5202f430ee62c676b9838709d1a1cf/tojisom.pdf In PDF document text
    • http://altaprecision.com/userfiles/file/faxabelopu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/87ed98a5f60be3c2278d7e4cf0096290/48335438578.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/c04f2c4cd7de681ecc899e269c62012a/67930437560.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070e29add2bc---zifunukarewirukuzirotu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/39476544056.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/88d82090f197811d582b7a0c5c79fda6/libipegupotisidetules.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8p9gevkmfrpqfej26llsp5rn7k/12650332898.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/78661508811.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877fbed348d---54184195399.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/51484094731.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/88129888366.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8422d70f75---49068886192.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/2e75649a109cca0787667e8ffb0e1fbe/77497660630.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/mejijevojire.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/6445159957.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/73501245672.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/10331869968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manual+screwdriver+antennaPDF 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_off0000adba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBA 15004 bytes
SHA-256: 530270b2fb9986a23f596dc29fd6995aaf07f9f375da41563136416ab3a9786b
font_01_sfnt_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 10488 bytes
SHA-256: f7aadf21f6faea64d633580a7b872c0c044950c0194b18f79a9e93f77beb1be4

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