Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9e4bb11316d6de…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 02:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04e909b11eacca507b8930ed5f9ca916 SHA-1: fd52edb4f8075f4e7f897d3953999ef1e4950ce9 SHA-256: 1a9e4bb11316d6de16f5533b7c9b8cade1cf08962264f9ee345a95af2a6389f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document containing a link farm pointing to multiple compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs indicate a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be71e5c0a66---nadakiruzeroruxogu.pdf In PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/174782a1bcd283051afc80a2cd0f0c00/megerodufit.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/71001794450.pdfIn PDF document text
    • https://cuichi177.com/uploads//files/202108110302145065.pdfIn PDF document text
    • https://wrd13.com/force/file/wafaguzagoposolidederodin.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e7dcc71b12da0eda8dc18f8195d68fe6/wivoz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8a3f0840ff807428ce8d4d315f342314/xemizixilebopep.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/12051954377.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/88151610937.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/f749a782834b1fd91b65aa75ec3b2073/jodupopajedabumonelaxol.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/13841235822.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kovejazigob.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/tenenujivif.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/36557147503.pdfIn PDF document text
    • http://chinahongji.com/d/files/932499736.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960a38d6cb7---dijibisugizelokogod.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/vazunot.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pazikebasodiregejurax.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/48836963740.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed9e7b8b6b---gexakegitamazetoxenukomag.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b89f23a707865476f90600796fbd55a9/nekeded.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/84091631917.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064a75d5ff---kelugovukevusosidu.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/35059094040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=translations+in+geometry+worksheetsPDF 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_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 10812 bytes
SHA-256: 23f38a2fd1161bc48cf886a28081654a985a1bfb3e9366e20e0f3bd6fe2e530a
font_01_sfnt_off0000e8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 16436 bytes
SHA-256: a2e926a57036fb056d9201fe5d2e2debdc55b67ad8e0fdeafb4d70a798457b38
font_02_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1