Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6526c51966a8f9…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 18:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6765e6334e34c22a90511922b227247 SHA-1: b20a0fb140ab6ea18a662df7bbea4387aea8292a SHA-256: eb6526c51966a8f9963b6cb557a4ea16cd7f00f0c914150ee879007edae2eb91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of external links and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=hobbs+and+shaw+watch+online+free PDF link annotation
    • https://hsdinstruments.nl/uploads/files/12186820907.pdfIn PDF document text
    • http://decorstore.eu/upload/file/49804630222.pdfIn PDF document text
    • https://edgecs.com/documents/63285541857.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/zagewelobewipa.pdfIn PDF document text
    • https://ms1oke.com/contents/files/lufunepunati.pdfIn PDF document text
    • http://bibikid.ru/upload/4208197045.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/1434098863.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5fb3bdfa---71546804857.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/xebofudomikegikog.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/81594696554.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/82852054786.pdfIn PDF document text
    • http://belovosushi.ru/files/kaxozaxasuxigesirutof.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/tupulojajemivafej.pdfIn PDF document text
    • http://schokozentrale.de/idata/30347948551.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/52391482590.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9fc13d9b---kugaritasowowojesivewil.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/kopuvudajowedej.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/badaganalefu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161393681c34fb---bemezexikezo.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/16692310678.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c82db5e0---27902425716.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d9d9be58---53891461626.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/43e6ea53afba640c8b11e32da07a8f39/79500237751.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_off0000e000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 10792 bytes
SHA-256: e5ffc36f8a31884ec29aa546d3fb722cbe801bd14f9aef4cf7413b5ee4f201ee
font_02_sfnt_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 17976 bytes
SHA-256: fd003adc3217fd0b7bf6c5d027a9db1f98d10ce9bc3f9fc552bcda3cb9660105