Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4cf8fad8b7fc6b…

MALICIOUS

PDF

90.6 KB Created: 2021-09-04 05:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cb43a5108787293a8abdaa7693cf79fd SHA-1: 664b675ed6d96a12d61249dc394b8d1516701a7c SHA-256: 5d4cf8fad8b7fc6bbff6b3b4791eaabb1afc7c09a73c84b36ea43d34151a19e0
164 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the download or redirection to malicious content, contributing to the phishing or malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://amirafouad.com/uploaded_files/file/2548526073.pdf In PDF document text
    • https://namratalakhotia.com/userfiles/files/melopebo.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/43847326501.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hbjpc4optt38ldpg65ld4bn40h/nerilidasurosiviwubife.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gomojejobanujora.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf94a4aed---kazivanudotire.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ff781698a55---93968387049.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/vegojululano.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/farugonofo.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/45206217436.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/xavem.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210807191155.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/basisuriso.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/36029143256.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/97092273179.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1ae647abd---91559529262.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/43i5qepqepi7qh0fctucacjaap/buvafinubakukupiwu.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/vejugovoruduw.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/mewepejoz.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/95822141657.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/d2d8c8ebf1af99733c6ea723ce2b4260/54256848882.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/winopapusepixa.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28347226597.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f9dc1a4fb---78674425767.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/74265084.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/3975080853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=this+love+that+feels+right+story+pdf+downloadPDF 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_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 16728 bytes
SHA-256: a4fa43a8924952d5045e10d68699617aa3af8ca0ce86975048f875154d8a5de8
font_02_sfnt_off000142b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B5 11008 bytes
SHA-256: 0fd9525e4b4d48696f59cea1f45de58c735f29d784678a8f9a6be758ea9b2612

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