Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68d203f2a2078ac…

MALICIOUS

PDF

99.7 KB Created: 2021-08-02 10:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 378af249b0ba28f868774c9df92816ea SHA-1: 0acea706ce2288b5c115dc6e4eaf719d73915687 SHA-256: f68d203f2a2078ac5068539a70f745a1bbf5f1419a12705cbd5a611a267fa246
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs pointing to compromised WordPress sites, many of which are likely part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URI patterns are consistent with techniques used to deliver second-stage payloads or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=como+fazer+apostila+curso+de+automaquiagem PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab3510cf55---tawiwafijogojowerafawu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f745ca213---rapax.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/76140274883.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160807cc9474c9---92457686784.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f06141c064f414ec21dc6e1bd775f1c3/68575813171.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9765765d---piwugu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/19566091218.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/1074110259.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607c50f4dac01---fesugarinas.pdfPDF link annotation
    • https://jxlmedu.com/file/files/20210628_092642.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gavudajegezinufasisezudog.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/nrc14f5n78v4ivh8t7hlo7a9dn/66595658441.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/07dc11fe3f9d2e120a5251d5eddf1a1c/40625156981.pdfIn PDF document text
    • http://terminsk.by/pics/files/61447286652.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cddf2ac98ed---83008950168.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/11738955620.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/wodowomuvakewofobodux.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/22736850628.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/546a3b660155eeb7568b4efd0b894f5d/6801063495.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ra4r0l2itu5ll74dcs6rdohmc2/romulis.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bqqasq592mp5kqi66gffc06rq6/gebedusowa.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/10373508608.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/zekawirefefurupox.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f73c820cc3adafda395e6a42c1cfddfd/tabokavowuweterixo.pdfIn PDF document text
    • 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_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 19556 bytes
SHA-256: 1447792845fad7469f3e552f2970e3b29406b1c745cd55828d725d12f0a06fc4
font_02_sfnt_off0001655d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1655D 11196 bytes
SHA-256: 17c7babefad0843ae099f3756a5f5b4448ee81d4077f05189457a14ee7d31cd5

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