Malicious PDF — malware analysis report

Static analysis result for SHA-256 2140a4f1ab86102c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 14:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da8d4f1a648f2f08701f3fefd3e94e3e SHA-1: cda8cc32f427eb2453d66a1890b48cf409d042c6 SHA-256: 2140a4f1ab86102ca6f59ba12ef250b2100a26e2acba0c2e912a9e107ab50676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=market+expansion+strategies+pdf PDF link annotation
    • http://nordicaluminium.ru/userfiles/file/78247797418.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/526513278c4176d80f8f9630e06a4478/gebosefugitomupepev.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210528184114.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/56ddaf3ee448fb546b141d5b27faf08f/guperudowutedomavaluxa.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/losuzitudiwuziz.pdfIn PDF document text
    • http://thaide.org/userfiles/file/69747072752.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/75388858205.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/84154177075.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b46949dedef---rejuwutin.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/novifujojiluzogawuluw.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/3560394472.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c8e0b49d7f0bd42fe972b240f3a2b5b3/moloninutesijukolow.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/3f1b3e55d63658317218f0e4e646a3e6/ziluvugizi.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe23229e3e---zawafutuxabagida.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085313c6c0e5---13910124030.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/lcme7lchen5j852vmbqrg5ds3r/27446291654.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/dovpai1if6s51sjt4ctlvc79u4/nedudedu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/fc928c8b73d5d86ddb736f25501e4bb6/gagizerujaganokiwizefi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107212204489156.pdfIn PDF document text
    • https://kopari.hu/files/file/1206885851.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0f6446c4---nunolumajugogoxedoni.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e92410fe8da197f637e3b18ce77bfeeb/tagima.pdfIn PDF document text
    • http://w-mill.jp/images/file/topawodivu.pdfIn PDF document text
    • http://wernitznigg.at/files/putexugipa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3f481014bc1022af952f0dab42f2d630/senejodajofuk.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69738952143.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_off0000c9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E0 10812 bytes
SHA-256: 5de865bce88622cd573fe9e604998a4bdb0b432a2597a308586a2ea8ad233e46
font_01_sfnt_off0000e2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C4 15956 bytes
SHA-256: 93db048cc89a4bdb1b8996e88c2a6f8ed6f9b80ee8a5756b1bb95fb9c2c20d01
font_02_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1