Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe866fd8b9ee814…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 05:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: feffd8f9dc17d16cb8596e59ba844b91 SHA-1: e36e12f6f84d8e01384286be543a15fc39b7b8a8 SHA-256: dfe866fd8b9ee814c18dc8c3dfeb6c29e91212706dabd15d4c0b000209daa27a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, a common technique for distributing malware or directing users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body is unreadable, but the presence of numerous external links and the heuristic firings confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/31f1f74383af59d7eb85f2169a20400e/joxozusibodudobiwamidom.pdf In PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/21704367064.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/rekexenufejomisupeseku.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5u7vbhhh0r23hp958qsrmvp612/26734450160.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/pcvhk90fjcb0f1mtck1j69ck51/narezekigaxomuf.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/winozadujolesagoloru.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/99597553059.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a96a4349---kinerorulorufozenatoji.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/027e16d6da6de9148f5a7ef7a13f5f0f/52339198011.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0f224fd6d---dujavineguv.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/digagiwobapusokijixiposo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15662d7b7---zasadezunopalokab.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a2592d96---mufuxofixedetepesar.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4ea8edd4ac14faaf85bf1ae88bec170a/dabudesufewapugoda.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae12558a1be---18955593182.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160728a9a1331f---51437241554.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/40693789872.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1d4eba57a---18056795665.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b34f553f1---6146952633.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084595d38c91---10370419644.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/jenarubazulalaj.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/veziketubog.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/kurif.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/8588c360d26f0ab2f8ecd050231c1d16/vekenif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=linguistic+meaning+in+marathiPDF 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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 18832 bytes
SHA-256: 55ee8bd940f45c5d90a59192e5d92c859fd8633996d229fe52c23cebe829b037
font_02_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 10568 bytes
SHA-256: b31a0e23d4bdde2b7cdf560338c3173efc37cfab67e9e3d9bda92110bed54580