Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6bc34a26ebed34…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 11:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b692134aafde5ff582846a34e1073eb SHA-1: d3e244c544ccd1bd2e9b5fbeb4c637bc590525c5 SHA-256: 8f6bc34a26ebed344960eb43dcc40e6458d9ecb0f9c72c815eec2e74fad89f14
176 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised WordPress upload directories and other disposable hosting sites, suggesting a phishing or malware distribution lure. The presence of external URIs and links to IP addresses further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://global-leasing-management.com/uf/file/98557650510.pdf In PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/daxigiriludamawixevedizoz.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/narisejaxanozidedizidoz.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/a6ak1r1ieic6lqdv5bct3ca0vp/38423048338.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa7c186ac---65614852959.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/74365557321.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/18655080042.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/15027909327.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077828f990bd---80072813590.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/41285595188.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/vebunubinotazewesixata.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b682ce98---nudazikifujasogolaxorem.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079972bbf4ae---vabikowopupokosusiro.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/90f20ff990e6ff30c6aa3ebf3ce27eac/9941826609.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/toxajuzawegijozi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4320cd391---sarakipalewok.pdfPDF link annotation
    • http://intertexmedical.com/userfiles/files/labapadabinefivotoware.pdfIn PDF document text
    • http://apcmagon.com/userfiles/kibuwatadi.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/44op6qc44nc955iolm99qpu1bp/46545725942.pdfIn PDF document text
    • https://wildnaturetravel.com/File/88825219824.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/60611389815.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/zatot.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610f36f6b8101---71447132863.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/zajipaxusoromikanize.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/44641202361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=metodo+simplex+problemas+resueltos+pdfPDF 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_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 18776 bytes
SHA-256: be6f8898f0f9f6f673140c577146035e5ca9c1a2825d9ebb2a7b98a5be5f616f
font_01_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10892 bytes
SHA-256: 2af35c844bc9b1a26456e483937cbb870213f6971f90d492455e45528d568bbd