Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f875f182addb256…

MALICIOUS

PDF

87.0 KB Created: 2021-07-04 02:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 332ec6e2214f64cb12af4eabc30d6b92 SHA-1: 7f6fd9e01044fe4c5743d40e4f01e99ccb7d0f60 SHA-256: 8f875f182addb2560bf3252413e4eba23fdbd17410b755dacc747a813905940a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to facilitate phishing or malware distribution. The presence of external URIs and link farms on compromised CMS uploads indicates a pattern of leveraging potentially untrusted hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://irlanc.ru/uplcv?utm_term=keyword+search+intent PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fd62de1d7---99350687567.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff6ede40a---robenamapidaj.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/37204086861.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/0097a1e2cace62beaa0d7850e5402773/fovezesagag.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/mtrpboodqj26tih31t0te0ab5a/budapikokina.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/10970902237.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/jgevqn3br3i0cp8v5j9c0kt5ig/32664108137.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/pejugexugexasote.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52c5328a0---zaduwi.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/89588203571.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/kogirazofekag.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/fevizalipatugirefazofizo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc66d9526d---kejomotepejudoje.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/xipowadekusosizapigup.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2fc02e30ef680e97bfb4c3d854f3e22c/wesop.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/difagogokiwavaxajalo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35495156796.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/21e7riv30tg34mh7unig93l2o0/bapuxakonebidafafej.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a51d8e76f6e---zutavemur.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zikofomirakisif.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c69ba49036---44580235380.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/43303279271.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aab36e69e---48860179300.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_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 10612 bytes
SHA-256: e61483dd8fd12bada4b219da3b98fb7483fe545f93eb88fdcbb047b684daef87
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 16828 bytes
SHA-256: a3def4fe9513239dc7e2ca9c99ccc2c99175ba00b8b7d73f6bd39fc958ccb9c6
font_02_sfnt_off000136e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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