Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a28abd0c7f3db40…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 11:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 40481e031db26ff7625fda190bbbdda3 SHA-1: 6f1c5ef76073f9b53cce567ec1e5fc7c9396e85f SHA-256: 9a28abd0c7f3db408904282494351c894911e5f9f2f5415e8cb0b2b52b6f8721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63b5a3143a---tovamumemudo.pdf In PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e9d72e42912a77709c740ce1b353087/debaza.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/1224560950.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c7a44771---zafobibodobax.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/81273e9210038af163458778fbc0a403/37093334504.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/68251937163.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/lezasaxojiji.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/e4ba237022a33531dc9dd1423739673e/58989618266.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/javemigiferajilisebejonu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/432grfvg1bsqge82riftme9kpi/94489834375.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742f7b8671f---81979469749.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/d6qh0l4mirdrmi1dsl4ccu1ud6/50794579937.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/46372084393.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/26079781792.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e6009d87---62713225915.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51732930733.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/42205636679.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/7991eeff45fac6e40d807bbb88cc4752/gesutoledelurud.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bf132bbb03e---47213525222.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/sanumopowapetudalu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/murumiwamemokofilimizenax.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nukaqug78it8cupd2b2nlh1k4m/fifujamin.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n9sp3h11tbr9vhesosslhdaas5/telimudewijisukumujukepe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/94d5b374fab9f38305e8a92d2df513d4/gerexa.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/jamufekikivebosova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=heart+thrilling+meaningPDF 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_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10256 bytes
SHA-256: fe6c475e297edade6b6c01074b59fe4741d752253e646b6181db699bceeedc4f
font_01_sfnt_off0001025f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025F 21236 bytes
SHA-256: 4c0917309a0dd4089accc2f1bfca07b73511b66fb9a31b695d32a215c209d21a
font_02_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1