Malicious PDF — malware analysis report

Static analysis result for SHA-256 72e65b1a849778f7…

MALICIOUS

PDF

86.1 KB Created: 2021-07-06 10:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c17351aea70c11ad8414c29a20581742 SHA-1: 5be8a51d3c5078772f8f8b759d794f22141ccc4c SHA-256: 72e65b1a849778f7722c02a0965b7b347a6e226c58b1136f82dd447e6b24e57c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=cura+settings+for+monoprice+maker+select+plus PDF link annotation
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/c8df9d74fbb361f07c8574fd4a5c1c97/xusepawanimotamebo.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/f3d4b9abce467a41c289a0b9e95141a7/tivaz.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/71430476855.pdfIn PDF document text
    • https://beliangka.com/contents//files/1478852924.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096c14180e41---gorezojapow.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea684d1ec---fiwunogejugi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0c9a7ecb---3855056923.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0ff72ba43c6cd575d29e03d7c9779061/46012857151.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bee0bebb98b5a9f0b10e02a7e6508387/mekufuj.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050221441173499.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/13d69e41adcc38b843b63005c4f91f91/72075947551.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb0e4b332---36066877316.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b22ae2b8d06343efeac2a4a4638afc73/69793649906.pdfIn PDF document text
    • http://peak-experience-japan.com/27779862234.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/56504593477.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49874432953.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ef181502---sisidibegatosos.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/pusibosowobe.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/32vma7092qsni85572k5b3e303/xejuvabaxisap.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ccdd97ca0---zipomuwutijijasisekuporox.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/vawexodiramila.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e0f71cbf---4312563684.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081192aae9ec---malinaratimovewuvo.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab649d352f---56042532993.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/judegufetajepeludigi.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_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 11044 bytes
SHA-256: 34fa89b7343f2e87bcb628bf53e857c341aa45a40e3146367d4d97602b38d79f
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 16852 bytes
SHA-256: 926428c954f29959b23d1fd3a0d9e440082d20218f8757036eb8bc36d74c9c0a