Malicious PDF — malware analysis report

Static analysis result for SHA-256 6207c6720dd97e54…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 15:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21dc5e1f03264b097fc83e63ee6c3862 SHA-1: 8c3828b0012b9ee7ff7e0d970c2ed28f0bbbf579 SHA-256: 6207c6720dd97e54b6b2bff8d27eb9172d76f3bf6ac24e9610912f39da0f573e
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several extracted URLs point to compromised WordPress upload directories, suggesting a potential phishing or malware distribution scheme. The PDF structure and link farm behavior align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://bluecars.pl/userfiles/file/64605379679.pdf In PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/kixiso.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7c52108a25ac3e9097fc7bfcfac6d56c/nujapepumavubiwotebebi.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/95245141253.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/54508790737.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/77276418830.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/80966067200.pdfIn PDF document text
    • http://retailcop.ca/files/foduzezigowipara.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161330ed0020ba---92308169796.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/23733669437.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/10042492977.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/72459891166.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/modujupegorogusigoxeror.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/lelowuvu.pdfIn PDF document text
    • https://profesa.net/userFilesfile/57262247588.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/84884080441.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/96574642283.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/fc54618b173546346ee4637ff08e235f/fiburumubitowinela.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/luriviwowe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/21024847986.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/62127266235.pdfIn PDF document text
    • https://spacio.hk/attachment/file/sowonaluvibi.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/kaluvu.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090823262115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+development+sample+projectsPDF link annotation
    • 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_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 17624 bytes
SHA-256: bb09afb14e0e87d2d35a0ca546efff9e75dcf0b57c6c9ce295f1de912a87e938
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 10852 bytes
SHA-256: 634e0d5c2f0df3712b2950e97a637d6a55cda3c6457039212bdd1eb1a0ea4071