Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e59edb9080bfa87…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 06:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 646d63cc5d7cac4622cef71106106c61 SHA-1: a25164845639aa28602208c7f376fb450c0d00ea SHA-256: 3e59edb9080bfa87dd9baa57123d2fa0f3d0ff826f34d93ca64bf8dadbbdce63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6qicvlofb39566ia6solgekbq/paxesagifava.pdf In PDF document text
    • http://www.contectrade.hu/fckfiles/file/73074773631.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///gijabitugenufiluzutas.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e62434485ff9acf3583f89768401ce7a/21141422043.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/9b8815cc4cbc7cfc5f431e31aae40e7e/31932601862.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/42993798677.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/jewatibivusejenuv.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/tofupafibewevonizevakubeg.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/lazerekov.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/dotanipowon.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a5b1dc211474b291c37cd3c53bc6f204/88489474407.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/sezejakoj.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611425ff5d591---34625769931.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/7510068324.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd8d7f0d5---lebodunufokanul.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/21333150624.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/wosanumimikusekogixoz.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/paralimarabamowuvej.pdfIn PDF document text
    • http://moneymaker-gold.de/files/19192603219.pdfIn PDF document text
    • https://ip-pharma.net/data/files/34577589749.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/gubokesowefuwufelum.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/38448559113.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c636e677ccb62886c086397c853cbfdd/wufovowodimex.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098dbe661310---32133256523.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/20338725446.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/77901504359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tabulatury+gitarowe+pdfPDF 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_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10804 bytes
SHA-256: a38b8149938193a0a0afd5c4d4addc963bbe33b2b5f531e53f5274c15850a2cf
font_02_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 19176 bytes
SHA-256: 9fab854f151ab6ae4f1aa1fefbd9d77b39e4d64c9f4086584200a53709f2da1e

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