Malicious PDF — malware analysis report

Static analysis result for SHA-256 73162b2fa216288b…

MALICIOUS

PDF

98.3 KB Created: 2021-06-29 05:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2fb5e2fcbcaa6318ab48bb61dc6ecc89 SHA-1: d02cc4ba04e91dd307d97618b59109134fd2bf56 SHA-256: 73162b2fa216288b348a79613ae1d9352d1f45ef92afddff69e8d15c41325cc5
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via a link farm, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391f162747---fesijuwagasawokudinif.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160875abccd07e---lofuganaregilisobenasika.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2af25a2d334a05b14b3d943b043df8c4/puzerugokijilodad.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5de87c5fb2c15eabc8525d24c8c3c54c/wamokujimiri.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/lifogufalibuj.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/ladojenedigejefijeb.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/34383779824.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/3b2efa33618f9ba42ab61506825c819e/80296404116.pdfIn PDF document text
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/93120796464.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ureqk2e7bhb24r130e6m34fe54/86395402903.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/sazamepiw.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e6cdb3d1---87940821044.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d659da63d---17703281378.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/jedoxikunumagabigesig.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a091b5af1---34858479503.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16091d9504073d---74716889842.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/juxokewopubojokuver.pdfIn PDF document text
    • http://ligneus.hu/upload/file/97132337972.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fa31029d6---66077671138.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6f986ba12b18884cc9a4400dfa7dd80c/98313535455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=in+what+part+of+the+plant+are+seeds+formedPDF 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_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 19708 bytes
SHA-256: 6d0ace857853d01c74c2a21190804e2de980287d3da1ede09bcb315d376eface
font_01_sfnt_off00014b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B27 10708 bytes
SHA-256: bc0345d213df4abc7244a930867428a6132f12fecfb5aed315069cf0f02ad22f
font_02_sfnt_off00016397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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