Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb33c0134fcb53f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 03:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e479dc244bff3d30ed01a77ae55f6d4b SHA-1: b88635070e18f1de690f45a2f459137a33dfdf84 SHA-256: ddb33c0134fcb53f0e31a122c23235a375505180c2163da0e4dd43515008fe77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7a5e2945---wurotema.pdf In PDF document text
    • https://studiovizia.com/webroot/img/content/files/ketamapituxiladefimujajus.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/ladivoxakadodoxisuve.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/wenonovokemera.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/13408965417.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/32691965132.pdfIn PDF document text
    • http://kleiberit.ru/files/file/runow.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/31977312670.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/bipixagutugimedeb.pdfIn PDF document text
    • http://zgic.ru/!upload/files/36807834339.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/40210871915.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/manivabuwelobexun.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/setuzixenokosagili.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fd13b5bb0---warimiborowizagebud.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/46651268748.pdfIn PDF document text
    • http://newo.ru/files/files/33270684001.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302770bb9c0---89591441257.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/67134918405.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-13/20210913110218983686.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/25927008358.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49886846435.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/sutiwudumedimaz.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/labedinunovaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=telugu+movie+2021+onlinePDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 17472 bytes
SHA-256: 7e0bf4d0a6776819c79ab1e7e1b972e19671f78ecff076f9b7bf245e72cba3cf
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 10344 bytes
SHA-256: d154532043586a1c29ce79d3aecffaf3875bde27bb85565b7f8bbb99ff518b9a
font_02_sfnt_off000122d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1