Malicious PDF — malware analysis report

Static analysis result for SHA-256 999cb90fd6d09842…

MALICIOUS

PDF

82.3 KB Created: 2021-06-25 21:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b857b33784e0fcf3db2a82c903a991c1 SHA-1: b5344ac5e4d28aaf9c91af2680c550d554e79c0b SHA-256: 999cb90fd6d098422c41b06eddf44db7ec2eae0e724797b947f430137ade94ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bukharaalpharetta.com/sites/default/files/file/3900200297.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086efdf87b5f---24209909020.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63b7c7a16---kugubi.pdf
    • http://comp-art.ru/userfiles/file/gefexesixofijiwazubufeliz.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5481a003bb06f68d1c85e14703405edc/domewobeber.pdf
    • http://atthaya.com/file_media/file_image/file/69422420829.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703331c082d---86366823584.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/6811853ad3a8d0a42e6f8efeaf58d29c/mamaxofumawilokijo.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/763a9ea5137c435ad0316fdc01cc58c1/5816871621.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea2925b1c---20847156652.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d0dee5b963baed7e8b4b3cfc067a47a5/jopuwefepotewubodejeb.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42713312f---94255484881.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/83784368b1562f64b5a029f105812f22/86411857201.pdf
    • http://axiomestates.com/userfiles/file/datodakivokokuxajaxu.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0d64938466df7769a3d5f4c2c298b6dc/20297860949.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c681bc2c3---17895017983.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/167ecad11e81dd026b440b624b0cc9b0/bufuvonewuxixexepuj.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9d18a9ef---32846242864.pdf
    • http://mywayrtk.info/userfiles/file/zuvolisuwodot.pdf
    • http://ahkjt.com/upfile/file/92309751993.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160763c7486e1c---77012555405.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160848d3d59478---devimejotekumalisaminifij.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/8ef04ec36711340026c8b5cff695c1e6/78513885906.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=christmas+carol+gloria+in+excelsis+deo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 16792 bytes
font_01_sfnt_off0000f32e.bin
090b1ef913ae6cd215711eb89977a61376d3fde034ea7689f25142a77f556995
pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 18640 bytes
font_02_sfnt_off00012371.bin
8be88176975608c0781077b45213cbf89cde3fa41acbbd71ae25dbd08b2ee4fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12371 10952 bytes