Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40a0ba578a8d06d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 14:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b15312034357e888de46ec9f8c844ea SHA-1: 23aca27af34c9a8c931dbf883db249303f1aee46 SHA-256: e40a0ba578a8d06d0a9dcb5e42e1aa9e8016f7be65b41d281f46217bd37aba45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not directly executable in this context, indicates a potential for malicious scripting capabilities. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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 https://catamma.ru/uplcv?utm_term=block+master+for+minecraft+pe+hack+apk PDF link annotation
    • http://www.sanjuktabanerjee.com/fckimages/file/63419673796.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/kewawipegakipebotelaketi.pdfIn PDF document text
    • http://dursunguney.com/userfiles/files/fupox.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/35428915172.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/pifupobisedekunoreginib.pdfIn PDF document text
    • http://czyxchem.com/upload/files/47966096415.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a2dfdd728586d627a5dd77ede2fd6976/10567148436.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/20967208927.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xisekosubofubewodeno.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306b0db36ce---jaxuwaliguza.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/90180089796.pdfIn PDF document text
    • http://mfcpavpos.ru/file/9521899058.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/89856428273.pdfIn PDF document text
    • https://soechi.net/userfiles/file/2589971770.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/44643864004.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914141852.pdfIn PDF document text
    • http://orthodoxnews.us/file/gibafo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8c7cefdc3---78501390378.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210919_8350a.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/sigilexidaronekesur.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/ripanejutijobuvenel.pdfIn PDF document text
    • https://5uempat.com/contents/files/segezezemifuxofigugoj.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/61642700358.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908042801.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/76486727439.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/nagoporuxurinat.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/jenobezimapupujoge.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_off0000b5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BB 17208 bytes
SHA-256: 8ffadcfeb5f6b204496d8161986822510a803ecf443ce72e42c0bd5a06000b20
font_01_sfnt_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 10892 bytes
SHA-256: e7123ac8e2c69e5d54200e13a33c9b2999cc3b47b2a4ab2385f31e14afc6da54
font_02_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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