Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90dd53b2d4f697d…

MALICIOUS

PDF

95.3 KB Created: 2021-09-08 06:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a88e0d7938d1ab78871c0ca47065717 SHA-1: 5d8eb7039669e9f85d47757917431243ffb03ef9 SHA-256: a90dd53b2d4f697d95e9469885e509606993fda179121e831d009278e3cd751b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://pokeocncafe.com/uploads/files/gapufipitinozi.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/82r1bmvi46gp3omgo83fmoelno/33930330014.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1620746023.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854fa395b68---dumug.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/tosafiropipeguzop.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/vivajofuparinibi.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63da56259---welimen.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/28252428234.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/lokunisosizuziw.pdfIn PDF document text
    • http://farmina.ru/uploads/files/21091855395.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/getok.pdfIn PDF document text
    • http://redactron.com/userfiles/file/12725143763.pdfIn PDF document text
    • https://denimder.org/resimler/files/15205862458.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7021b5f3---54122989815.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/68dbcc197544dec7ae89f7e9bac5a56b/wepezoveratuf.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0161e5b75---megozu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/xaxoxinobomobowil.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xaxekasuvulewi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/48808523453.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/42354996393.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073a775419c7---46619524953.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/37464827205.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/81420083318.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/70376028642.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/jetubezu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/529a008ca9c000eb12415cb16042b10c/fikunavopixivejepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hydrometeorological+hazards+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_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 11128 bytes
SHA-256: 8e46f9043ac514449ae2f0ed6a23acbbfdcde24f36a9b73e28a1b9ec4df7ea6a
font_01_sfnt_off00012542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D54 19424 bytes
SHA-256: 24cf24f9370344ef850dc9962f4940e0799a91299572b03bae3753e084403260

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