Malicious PDF — malware analysis report

Static analysis result for SHA-256 5668e1a15a435346…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 23:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdb12b530b979a450dbe579f68929d23 SHA-1: 1e3a8e0f6603fcdf37dd56696ddbd3ad467cbce3 SHA-256: 5668e1a15a43534655c38917cece00aed1f0938900c238442928202eab89ef02
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 high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://krisoc.ru/uplcv?utm_term=westinghouse+solana+ceiling+fan+manual PDF link annotation
    • http://telmeed.com/web/ckfinder/userfiles/files/welovunijenopebixetipis.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/foripimufaku.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9bb0bce7---58840221092.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/67749728355.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160affe0e7ebe9---kosuvasiwoxasivosizuwaf.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tasedife.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/95005532276.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/24229990269.pdfIn PDF document text
    • http://shopabrang.com/images/files/gimibumobaforebilusi.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/jevawizumetus.pdfIn PDF document text
    • https://efnnma.org/files/file/46154148754.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088082f6872e---41836785355.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/3916678929.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074966c8d885---14499756120.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/wafuwe.pdfIn PDF document text
    • https://www.oapublishinglondon.com/ckfinder/userfiles/files/vixafinilofovuz.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/793a4a07a1564dd511c914873f5e4134/22985285726.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae65d96339c---70973926695.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f596885e5c---45556436749.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bodevobe.pdfIn PDF document text
    • http://sy-smile.com/upload/files/sapenomumafowaxuvewosupa.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/kt83locmsld7paqcguqfcg4cnc/vasetezak.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/60934471284.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607219a92fe27---nanoziputufuduvupogefot.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/11263619125.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b097b062c27---loxagegokafojiwati.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_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 16556 bytes
SHA-256: c517d2049e1d24bcad986ba100e2f2a534039bec195d55fb05df88ba21acacef
font_01_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 10776 bytes
SHA-256: d7a8d0bf21bb36b013017677faf7034e6028234ab70bea9725ee7885a5566bb1

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