Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d813fd1fc94cd88…

MALICIOUS

PDF

98.8 KB Created: 2021-07-13 07:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dcd1734d30e59a938f82d4b6dd81d1ed SHA-1: 04381711fcfa45a239b4de0d8849ede7d43de4a7 SHA-256: 2d813fd1fc94cd88a58c8db2223e758cdfef943c9dda093ab7c12efa238d3c2a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/fb2762027d889c0982ee7bca63669447/pujonabesurapomi.pdf In PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/ximokuzilazojabewa.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ch0m4jsjonact2dkq238r06kn8/goluko.pdfIn PDF document text
    • http://sansboundaries.com/clients/f/fd/fde0d4b6b324343791c5f0705b221951/File/zebozovanenimegajedute.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/90773449946.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/46897582121.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ebc141c0---ribizozamebivume.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/84169783592.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/79355466807.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/11567699696.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/dd8bb5ab88367aaef9281790925f037d/23433166099.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/112802540960be76f4e2615.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6babec629a---reduzadokazisagubeme.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160befdde53347---nilalixuligevoxowolom.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dffc1636b9---rigovojosezopikunogis.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/voluvovegijifega.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/37449262367.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/vgqr3gqr6fvd4sflbp2cqgtj01/mefedaz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aab64ac0---fefubajuvivojito.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7e2da50f---xadadusat.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/57639ad8e44bb48b1485c31c5e77ce56/53696208302.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02c81ac76---13805815298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fastest+running+dog+in+the+worldPDF 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_off0001228f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228F 10688 bytes
SHA-256: 77d047b0df1f2011b95b90300bdce5b65f0df07834f8bb8cab478401aca33ace
font_01_sfnt_off00013ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD9 16644 bytes
SHA-256: 578aa6947ded7e984028af31a073f727fa84b1a5432d8a1309291e662056ef36
font_02_sfnt_off0001660a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1