Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec4eec9bc576c77…

MALICIOUS

PDF

81.4 KB Created: 2021-06-27 06:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c4a1b0b4e2c88d20f1bc63919ff156e7 SHA-1: 479b48f9fb721349da064e7efc3a53cbd02193fe SHA-256: bec4eec9bc576c778a6836cf016d3e21bd4824322207f92b5ac1f14c63dbdeaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://humanitool.ru/userfiles/file/72995562841.pdf In PDF document text
    • https://kede.org/userfiles/file/65401203605.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9cc50d8b2---gakeg.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/rolul.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607489262cc8d---33155831692.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/turirevikefokukozuga.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/biwaxovalajeroz.pdfIn PDF document text
    • http://juha.be/_files/file/pozaraputafijamujuwoxafa.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadb805350d---wevigipefewisufetiz.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a35b9b13ce70904a1ac34927cdeb439b/62892386581.pdfIn PDF document text
    • http://groupkaishan.com/d/files/tivifolesogapinab.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b35413b8---29949308131.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/metotuwagolig.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/59476173920.pdfIn PDF document text
    • http://techbis.pl/files/file/72343923467.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082a776d1cba---fazidujaka.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620827736.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822be876cae---tugus.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/tuzilomefewe.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/kitera.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/99514035224.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/5121562036.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/6e17129425ee6c6733dcd948a4087d3e/88516349819.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=solar+energy+ppt+template+free+downloadPDF 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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 10856 bytes
SHA-256: 71333050e51d6486748cb81349c40c6aaafe19c1e12eda969bd3af02e5bb2c6c
font_01_sfnt_off0000f419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 17060 bytes
SHA-256: 21bbb9b8fa9767d0f5291518689284769b91c7ad924e4b49b1771439c16daefa
font_02_sfnt_off00011fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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