Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5406a20ba591af…

MALICIOUS

PDF

75.9 KB Created: 2021-09-02 07:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fc93513f085b590366db7c70c91a944a SHA-1: 92d7721a6aa8e20a8bd61166ddf79aed0b0345ae SHA-256: 7f5406a20ba591af78b3235d47da65233bec86fe2ecc385dcda18fe94f5ac0c9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several heuristics indicating a compromised CMS upload and disposable hosting. ClamAV and ML classifiers identify it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://observatoire-omic.org/documents/file/8360034513.pdf In PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/xulegolipan.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/ruvowezolikaxikulerefovin.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/14712423623.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1ae863ac---58940062505.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fufesegexotezuselun.pdfIn PDF document text
    • https://curvy.tw/upload/files/31284797918.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea40a921ea---57054419582.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/12086213180.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/tilipamulovavovag.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gojobevinoresij.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/feluvoxufawer.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762e06c7d0c---kizawokuvotiwu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b379f1546273a39ae042ad23179cc43d/78140606270.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d329c8a0ab689a34406d5db9da2f5de5/2792639084.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/70637150138.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/59178172033.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/g1sr7kgvq5j23kdg5afn6king1/88743575861.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b94a1eab7ab---31422366156.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/mapovugen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cops+and+robbers+fortnitePDF 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_off0000c2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B0 10616 bytes
SHA-256: 14a0a11989a442c5daf2e79feb7f7725a6c9adc5aacbdc210f7809a7bd7f279a
font_01_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 18000 bytes
SHA-256: ffcbc80c4ac968e1577870cb336f0809423dff11b24c7b92afc0098f5dda8e5f