Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1286ce1d59a90c3…

MALICIOUS

PDF

75.9 KB Created: 2021-08-19 00:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: bbbb15724b6297d3ac57c3920b4105ac SHA-1: 83026bcebf786634a3a25def533c2d30d8af49b5 SHA-256: b1286ce1d59a90c36854850ea404793edbadd7f6b1df6c2c9290c7ffb86fd822
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malware or phish users. The presence of numerous external URIs and link farm heuristics strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088cb8094f16---43397828246.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bcaf7220f3c09b63108fc703b727662c/31752017625.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/tumumavixizatefibivuginak.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/25225713918.pdfIn PDF document text
    • https://dcimx.com/files/75747465256.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098b2561f3dd---wopewilaxidudo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c44f04e10---84304903533.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/96392506012.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ab8cbb8fcec3031727847e00f5dc1381/podap.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1a4e0d957f5ecbc54c36e3bf21d596b8/38712064001.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d80ee5b55f3cd100c238024aa090f570/44365772034.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/7047d932a5abf191cf077c2c44d4dce2/95757320637.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e590dd3bd8418476a8e60663936c6d3b/95504904966.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611299ee96359---85352648466.pdfIn PDF document text
    • https://0900107678.com/upload/file/5302598989.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/xupizelu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/gimaweso.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282aa7b86b---9864567128.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/5677804330.pdfIn PDF document text
    • http://whatdwellswithin.com/file/48110882218.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/dusisones.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c507f72027b---19811510042.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106150237553657.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8bindif8urb12bfi1ppbol53u2/jujabawinujizujupegidibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=libro+geografia+2+bachillerato+anaya+segunda+manoPDF 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_off0000bdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDA 18164 bytes
SHA-256: 76e96c1b1fa95cfc14890e3b5fa9c428313acd59d4ce4fe6df66e13fabccb572
font_01_sfnt_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 11356 bytes
SHA-256: 58079a0d2ffe11dbe323c05d05c8f3cb9f496c19dd71a60677106cb56a340571
font_02_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1