Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ca677c581ec440…

MALICIOUS

PDF

93.1 KB Created: 2021-07-19 08:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65ed0b84aa9c4ae908879e4a2068f639 SHA-1: 5027e684c4a985397f15f42f1c0405b77385a767 SHA-256: b0ca677c581ec4403251e79f4340245c592a8a11cd83d8cfc25bcc0fc8633caf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://soles2walk.cz/data/file/68102176100.pdf In PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f73dc1fc6---pumamijuvemafuwel.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b7abf1925bcad246c0a5c50f53e8f48c/8191442074.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/66435257449.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/04b03074c26f829d3533c9fda747bd7d/76301925371.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81497ca46---79085174870.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1626098513.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160840144db8cd---visanimavijizofofugix.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073f84df34e6---fisazebasebugekokif.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8c0bf6c2---70328782802.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/16885026896.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/78501521896.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cd1f3110f---nifepalokiluw.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/5483179150.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4f74a11e---91741834325.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/gumorunu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/tagatojawodoluxominevu.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/3990440163.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd820f633---13080189497.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/9785492341.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/lapededok.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749e730d0ef---norinaninaz.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa1e0e362---97270462541.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854be82e0f2---zixolinimix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=addition+and+subtraction+worksheets+pdf+grade+3PDF 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_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 16536 bytes
SHA-256: 96ecc203f5ce426d37fe6a52e03ac5bb0888d3ea54b89b496a0928512da5f795
font_01_sfnt_off00013415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 11424 bytes
SHA-256: d6f2be68ce80d8e38167da6f9c2468f7c4a3530e3cdb8e1b1aae8baaacf78944
font_02_sfnt_off00014ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1