Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f9882df1876c24…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 14:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e0de04ea0d92f73245fc08bc9efaa05 SHA-1: d42a8e02460f60d758521f4035b92a6d5e48b632 SHA-256: 32f9882df1876c24e95ee384faf2e236508f6a735ea7dac98647f0b76224d659
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=android+processor+octa+core PDF link annotation
    • http://izumrud38.com/ckfinder/userfiles/files/vebonabuxagaravikalazi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/letezavelu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914151442238608.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/tovajowugumal.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/12821419332.pdfIn PDF document text
    • http://12shio5.com/contents/files/26763497675.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/30092159847.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/32250377473.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/44291415174.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/rilunitedazifekufi.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/texurafififu.pdfIn PDF document text
    • http://safetruck.gr/images/file/wadidif.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/73714258609.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea6495fb94---limunolafotasosu.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/guxedanejovimisegemo.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/jilipipexugopab.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161463f8b41301---49072389208.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614075076158e---salifozi.pdfIn PDF document text
    • http://proetcontra.hu/userfiles/file/rivuxija.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/milam.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a80162f09---goweda.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/69178686229.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/09052651258.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/moxiwegukokujoporor.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/01946fc693254afc2f393e1743170037/34093195074.pdfIn PDF document text
    • https://lapdonline.org/file/65739115364.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_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 18516 bytes
SHA-256: aec3aed2ca6242ef37e0d5a65fa8fe22b3be2a806c619f5e1b37723f98023ab2
font_02_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 10444 bytes
SHA-256: e0a61593854c4ecd2a36432532e41e08f8986a33c4d3e05d22dff0dedd2974f2

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