Malicious PDF — malware analysis report

Static analysis result for SHA-256 d499d1c4158a6444…

MALICIOUS

PDF

95.9 KB Created: 2021-07-19 03:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9587f3cdea2e93babdcfab4c1f58e15e SHA-1: cb3c8e5842dc2775f868d383d23f4188e290d2a2 SHA-256: d499d1c4158a644495199decff91acdc467cd9ae7b89c1e57f4a9b48effc5b4f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that uses a social engineering lure to trick the user into installing a browser extension or update. This is a common tactic to facilitate credential theft or malware installation. The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc4ce1e44---rozelimemil.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0499c5c65f---zowufidavumabavaxegikezo.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/76569728198.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ece4e8ed863c751d81a9e13075bba3c0/leroliposiko.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/18448287607.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/e5b83533f9358dfd5a195242a9e231f1/zupudajevumare.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/48288921319.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nitetemumitisobasusiwusu.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/satujazixef.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/nvssbm16rnrth68f0e6jg6cktr/91661145015.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/29789615142.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/rafutejudufasebebuweleko.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f20f7c519---xawaxizu.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/63418030415.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/90833530906.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0fgltbr8r7d51nrg820u1sd720/85880687326.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/31812774382.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/61358960287.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/327b3577f34b027b37a9739de52532e6/13846710639.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/tigezawor.pdfIn PDF document text
    • http://praguetransfer.com/files/file/miradebaboselixogekumupa.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/59180444343.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070775244744---goboromitomuzir.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/132c861f27c2c684c1aace6e67e8fec0/lutepedelokozid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cloud+infrastructure+and+services+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_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 17708 bytes
SHA-256: 0bcbd93934dee40b86cd5da0e0c70158bdc0e64863bc03587aab2633acbe1810
font_01_sfnt_off000140ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15903 10812 bytes
SHA-256: f93cc4264833bab77991a564eb705668cd10ce18606f0faf749a7a6d584e3244

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