Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b81ecd3cf98408…

MALICIOUS

PDF

80.8 KB Created: 2021-09-15 21:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7823a6b5d8babd0bf637625cfae7ea5d SHA-1: 69a177b9d5ea644fa1fd0b6e72a5bc11c6daf062 SHA-256: 13b81ecd3cf984084816f80f434e0a86fe1cffa1aca0bd2348094483e7c9eaee
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it's designed to trick users into installing browser extensions or updates. The presence of numerous links to potentially compromised or disposable hosting sites further supports a malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sloplast.com/userfiles/files/tupuz.pdf In PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/nujava.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tirewilinilamu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/57182392887.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/bosezuze.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/sutamikemajajejavi.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913080405.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/zofadozudetebuvidibe.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/dibaxulebagemes.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/72903782987.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kamuv.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/subuxebe.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/rurifaxetotige.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614135e58c98f---30275804315.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2ik22cpode4ositf8bqgjjt5go/7088616848.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161352d159bca1---49663898049.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/ragurodubavel.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/47197473259.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/6671242573.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/wuvonun.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gividuwajit.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/dekewupot.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/9175292834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=voice+chat+games+for+androidPDF 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_off0000da46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA46 10844 bytes
SHA-256: 01784a6db854c1a150541028c7c30354d27fda833d1aa145e69fdca071368393
font_01_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 16636 bytes
SHA-256: c1fed852af0c9c5197052e157996d70ca702efbf4f845816998a2c6a59cf82ad

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