Malicious PDF — malware analysis report

Static analysis result for SHA-256 799d3081c1f36d75…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 00:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 77adba03ada3c1985ef0411952e0bc06 SHA-1: 190dc9aa10ff1ceca28600e3b10c0734ea02d392 SHA-256: 799d3081c1f36d75ce427278992d84da71e5f4edff5435456cd11bb1eeb02031
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The presence of numerous URLs, many pointing to disposable hosting or potentially compromised sites, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=convert+radians+to+degrees+formula PDF link annotation
    • http://abwlargo.com/uploads/files/41057199423.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5a15d2c1341f67fbd24d03ac4d2e3d42/mapajelu.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/91073916518.pdfIn PDF document text
    • http://quetthe.com/upload/files/tedokejarifevasaf.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161450235e8942---34643655406.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/11823925854.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jitowadonimabelekafas.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/48619635812.pdfIn PDF document text
    • http://recrute.fr/files/files/negapefi.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/89506987325.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/fevife.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/pebovonovelotogezer.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/41319040062.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613858e3b9a58---59578026757.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/68823723208.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/vezexidopegatuxe.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/bomuw.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vofofovewagag.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/wogijipubas.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/77444861180.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vusifodixi.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/famusisavogoramuso.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_off0000b59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 16424 bytes
SHA-256: 06336eaf6fbb6af71d8c9549c65bdd8aef9e539486b0104aad45c07e2a9e0d47
font_02_sfnt_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 10896 bytes
SHA-256: abbf18e513c2b80234ad2c1d30aa139660fc90798fe35c04a7bad2c5b8c9bc90