Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9c2856fc76bbac…

MALICIOUS

PDF

92.2 KB Created: 2021-08-02 15:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15c480592a5e3051ddf3441cf1f00874 SHA-1: 284b0958739a90385380eb8564ebf6030e7b60cf SHA-256: 0f9c2856fc76bbac8791f8b7353d4edb1344a45be98c18c490aaf7a5f3179cda
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098468b28333---razuwuv.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/1aacdd69955af5d54f20774ca2752bd9/vivifajuwoxinetixomigux.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19ad59dc4---37055049021.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8d743635702053b259d1e1048bb284a4/27574898987.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e397d2e715---mufefikozasalelafu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7050195644caddd2f87dc65549fb1311/gojoxedut.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/35241574997.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gexijivekikepigis.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/a87311c9a112f2a99a9cca472065db7e/minedafilikezivimobom.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/jowerewo.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ofuujchkkb4tl7nqftpc8uv04a/35474636865.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/jabatorofudexirek.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4972d5c2a2289ebeeabf3fc163f450d4/janubifokulevodagade.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/ziganevexobutuk.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7735b3f3fb002da034cac52018b85431/bubasudazijuwijurazij.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/d9886e9n19hb31rnnih8pspce3/sokolo.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/86074691649.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/fijovex.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/dabitigixun.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/zifuz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/79935871310.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5e578a196eca65000ce9cc7f8eb11a31/luminamimura.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4fcdb6ca---bupotux.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/qtln7n47egu0art244k2mohsin/bukezuwagigo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5edcb77f0f---21336416077.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e5b0777a8e7---81439814893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+mine+for+bitcoin+2020PDF 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_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 17644 bytes
SHA-256: 2fc7057d1169cfc3b53c2a05fd5945f5bf91d6c516834212ad8da1f8291156f3
font_01_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5F 10580 bytes
SHA-256: 600d096a94dbcb67e8736d149c307a9526eb3f528d1509d4c974559e2cf60d1d