Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3be3cb4575ae22b…

MALICIOUS

PDF

96.4 KB Created: 2021-09-05 18:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d5cccd66ba68dc622a3a1b11ca746c31 SHA-1: 1c9aefb3edc831879c64e85b573b0cf31a9ac771 SHA-256: b3be3cb4575ae22bf2d4f00f65a4460352e41d3ed0352180e0596ce3057a67be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/24625234080.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/79df982ff9ad85d4bd265819e18bcd54/72978436152.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/dasowibozikegabu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8f929045a23de2ec54f21a964eaafae1/nazutagaxiluxizugesex.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7ac88bebd1da6b602064de20df50a8b0/5739777195.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/74103898387.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607410a71895f---fonogefofakoxufukivizodo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d3fe5d506---31429785202.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kosawemozi.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/53244150210.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7372b2109---86571067938.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/12567874598.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e73ea619b---85884950566.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9185c494d---4287078142.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607701429aa54---roliloz.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/89151774980.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076af4247155---98863350448.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/gurizewemexi.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e911ad48---relefuketolipakegenajule.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/5g1kfvn4919t0ckfs1sbhk4emc/15372607830.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/buxexetoparalewokevedi.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/80283104346.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/rafuvavawejupoz.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/54ec03b6c243398125d3fcb1c10b2152/89754546096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+singularity+is+near+kurzweil+pdfPDF 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_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 19988 bytes
SHA-256: 6fb1ad041999a0c3ce993744ea3f748bc59511b62109653689efcba77ba09e6f
font_01_sfnt_off000141c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C3 11072 bytes
SHA-256: 2ee6ad09b5305a7bcb0d706d1a6f9cfa7decfda2fb2761967c81e483669de21d
font_02_sfnt_off00015b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1