Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e928d21d03723ce…

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 14:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 897fc2965a5238ff4e79065365e264dd SHA-1: bb40e392e45676f8c2089d97d6a769bfc23ebac6 SHA-256: 3e928d21d03723ce32c8867642ca1c5d0c2927f3f99c9918e95aeab8394d4494
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 an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a lure for users. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a3643b71039---dobikogakobip.pdf In PDF document text
    • http://elm3rad.com/file/ridutuvifudoselokipojaz.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079feed23cdc---16065724352.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/93166981457.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/16344169419.pdfIn PDF document text
    • http://ubest.ru/images/file/vuwebulujomokijibiruzade.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d74a110c02251dca973c87cfc514bfeb/sabixobusir.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/85659400662.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/56492911545.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77371426262.pdfIn PDF document text
    • http://skupka54.ru/upload/m/66158686759.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/69803415757.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/jorosevafugidopukupagip.pdfIn PDF document text
    • http://temple.mo/userfiles/file/zefasudesigibifa.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/21934610651.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/sevuwovuvonukon.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160966311c0072---gevadofabe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=income+tax+book+by+hc+mehrotra+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_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 17676 bytes
SHA-256: 0aa0d75f6fe863a233fe5d5495eb25273bc048ef8c3ccb8d12d0b77be16103de
font_01_sfnt_off000126d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE8 10976 bytes
SHA-256: 100cfea55c3b8f510026cea8ae89c0d31346a4bd73e776314bceb70181f6e6b5