Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26d806735d459a8…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 17:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c68f7c9e41a208e61afb7f312979745 SHA-1: f64aaa38a234372eb310d3db4f8c006660665e2f SHA-256: b26d806735d459a8996cc6dcc38155a3385bc1abf39c90579b2ac7a97b8b6e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 https://pistant.ru/uplcv?utm_term=syllabus+of+ibps+clerk+2019+pdf PDF link annotation
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ffffa2a2c74e286304a5c7663700f56b/dabimor.pdfIn PDF document text
    • https://roc.mn/uploads/files/79683028649.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/zexotiwivinejevoxasowaxib.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/jaduvobosojumisin.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/pivogura.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ad4215b2af---turete.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/nuvazugumapalopevir.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160718d2a0cb57---6380068388.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6de79c821a9fcd84bf9121deda3ce51d/23777889194.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/14036s9cpil6fo26pli15ao146/riputakeviludujusoki.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fefd1d92cd---kaxisoxodadegokobipakat.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/d054vji9n8oi9ff0sd37glg1gg/miwazogobatomero.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kijodidenapivigifiti.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125cccaab7b8---33632774798.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073817ae3289---walufupeteg.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/tigujozeborewubatemum.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/dokutokepu.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/woximowarawonovulutodi.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/63148505567.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/18122526117.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c4516d6d---29850693794.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/86641072246.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/9981204723.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/joriruzaw.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/55a0bc1567a3d3da1f37fbb91d9eafa8/wabonenip.pdfIn PDF document text
    • 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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 16908 bytes
SHA-256: 05c17bc2d30a0ea04f934ed528f3c0db20b3b94ace3d303d349889a6bdeb2aa1
font_01_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 11396 bytes
SHA-256: 0add7cbe5e4701d1481efc34583c5fab89168e93cb03277fb27907abcf4941e6
font_02_sfnt_off00012a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.