Malicious PDF — malware analysis report

Static analysis result for SHA-256 894152a1c65470a3…

MALICIOUS

PDF

105.1 KB Created: 2021-08-08 20:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e4f28d1d14224565b7e5ebf80aa80d70 SHA-1: 694cf850fe781bfdbe1e06086d0e4164d4df158d SHA-256: 894152a1c65470a333de29c39a27f7735d608428532a133eff6f6ecc5f873310
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc37f7c31cc---bivaselafes.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774775c9100---dadumejuxibolofedipefusel.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16228098921117.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ad7dc227a2d459cfe937cf7ae1ec5d45/80647948534.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/ramatases.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/fegowexowasukalapevogofa.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/legovapejis.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/26027474458.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/528584e4fb184dd2a6d1126e32af3ae4/goxabozadozamirarisam.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c63fded47---54423995305.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaf8e27201---65202866978.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/18978812075.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/maloj.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f7bc7bff---88336324076.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/54701807770.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210608173714_960995228.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/tutofatatokima.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/desejezif.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/pelonoda.pdfIn PDF document text
    • http://sy-smile.com/upload/files/nosudifetikumufagelikofil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e603692f3f595bcdd88afced3c8e0c83/92280718584.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/pn3dd3dvlnk4uehhsll99trpj0/2450916448.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/17441284837.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ebac3c4100fbb3641de03affdf1c5101/67750723114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+get+grid+coins+in+dragon+city+hackPDF 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_off0001388b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001509d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1509D 17276 bytes
SHA-256: a8a6a98f411e8eed7e0273b722ec50e2094608ebae237477a1462ea129ff86d0
font_02_sfnt_off00017d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D16 10888 bytes
SHA-256: a9a3d358f562a9cd4c46125107f29d0fb7753abeddfc867b6ed26e285f2f6726