Malicious PDF — malware analysis report

Static analysis result for SHA-256 234f1f733ad3979c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-11 23:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fa745e867ca1bcf0871feb60fa64ba9 SHA-1: 6b6d6f2ae43784eaa126485508ade0cd3dea3108 SHA-256: 234f1f733ad3979cabe980e16619060a51c3ebf854ce57a942a75a487ac33200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress uploads. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content or phishing pages.

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://pixomot.ru/uplcv?utm_term=abbas+and+lichtman+basic+immunology PDF link annotation
    • http://le-bouquet.be/userfiles/files/latobezipotolonor.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/44004847410.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161366e436ae98---29628608788.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/juwodenemipobatexezut.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/zalodaramivexusat.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/82963619796.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd64f47a0e---76236716045.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60507094596.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613283f238b70---27479712030.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/kunupamuli.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/13832470405.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/losabugupazogawojad.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/96062200697.pdfIn PDF document text
    • https://cakkue.com/contents/files/gurarevozogalarowofelaxap.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ea0e2dd745e736343d28e5538151c349/sulagusuludu.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/22572862765.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vilux.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gotitowemiwoboxovinineb.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/24435755233.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/37951577066.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/tavulutenebatalovedar.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/tawamidiri.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_off0000b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DB 10920 bytes
SHA-256: 9d79cbf0e44c466845e30e161d5a9634c14e5a15b14b01b3cea1b8202f1f7789
font_01_sfnt_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 16936 bytes
SHA-256: 0b65bdcc1a3921dcf5a3fffe726045c10119879e09a6ecef2a0592571301e574
font_02_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1