Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3548ecacaea579a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 19:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c065a020c690973a4d8d7f9f0162508 SHA-1: 8789ec1b13708a4fcd4ae1391ec9ac94de0f733a SHA-256: a3548ecacaea579a22cb2bc0315bffb97acce1c70bf1af233cee411c89784e13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=best+truck+simulator+games+for+android PDF link annotation
    • https://ip-pharma.net/data/files/19647663677.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340a4bd566d---56003597418.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/berenuvejibivifunoz.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/felitatujupisiramo.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/denafojiranoriwodilis.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/14271820917.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133437248371---fifogifuriwon.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/95339798927.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/c49pq7kkpq6lnh2ese7v6fp0qd/86887105637.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rewukeduwepo.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gijofowixegowanene.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab6d77ea43---risagofeworaz.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/40703106260.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/75685201054.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767bd8932e---remele.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/suxipo.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/764158b08eca8ab786c3e500c3c5cb02/pijilimujafefeke.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/tufazarinil.pdfIn PDF document text
    • http://zimmerei-possert.at/50333065884.pdfIn PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/58884417626.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/92309088323.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323b55f3b11---49785795424.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_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 11064 bytes
SHA-256: db8a0c3f6e92d4ec4991b63448f9b354ff0f07eefc82e56accf7f9dc106d4437
font_01_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 17872 bytes
SHA-256: 3afe840815b3b3bb367ae354e47eae39cc331b7d0c8e90e0e8f5865ad661ecbd

Open this report in the interactive analyzer, or submit your own file for analysis.