Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66f9e19d7632fe4…

MALICIOUS

PDF

128.4 KB Created: 2021-07-08 04:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 35b881b15f47310f4e5772e5325c4e78 SHA-1: b96f8d003cdfb6ff9bfed73ff4cbf32469ed2a86 SHA-256: b66f9e19d7632fe488fbf0680f22ca26dd2c87d94166c9e9548bb39d33886a58
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users via malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078095685e52---71016161813.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4c0d1ccd---68923815091.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7927f23982---xikimifezonaxaxo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c93edd81209---50007935834.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/becf76b7ded0e228aaef6979f0e86356/11472952737.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16251269854952.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a996c7e6---16395146256.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/2063864291.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/ribejakaladulixeje.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/34893065795.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/podelavaxezojaw.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/52710d218c67bf8961e3083ac02b9b96/18434780843.pdfIn PDF document text
    • https://room12shio4.com/contents//files/25609278652.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/10074822697.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078729d5da82---moretadawezubudu.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/9dr0irejoptli6apij1e4102lg/lutavakipatomamebaj.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gjn2itntl6lcke0j3h86vnrq1j/guwoberimajenefit.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/1474235708.pdfIn PDF document text
    • http://davcpundri.com/css/file/9435538387.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ed711a9f800ec57e5a52d1441553248d/woramakukozusirejikeza.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/993c7a1b56fb38595bea39c20aaad6cf/mozoruwofojolamuwizuva.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ed7j38e0du9gh6maf4lcl69r15/lopaparedode.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/kajapasilinobivanupesovin.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/017d010f5448ea58f023865b2f4a0adf/39925217575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=why+don+t+you+play+in+hellPDF 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_off000196d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001aeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEEA 10428 bytes
SHA-256: a2904a9778422c2ba632fd3f593a31f4c709c3b22611612e6a6255780987c468
font_02_sfnt_off0001c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C66F 17496 bytes
SHA-256: 6d622ef69092907c08c92d1dd3d13971a6dfeaa472e0b4fd7ff691c1edea5ca9