Malicious PDF — malware analysis report

Static analysis result for SHA-256 56771e8f4d93f11b…

MALICIOUS

PDF

109.0 KB Created: 2021-09-01 14:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3b2c55c3a5644a478119a17f0fdfbe3 SHA-1: f5d6262619679c78cd54eedb428472f52ccfdad6 SHA-256: 56771e8f4d93f11bf89685adf160205b16fb08e643797d3ec6daeea234ecccdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=driving+licence+number+in+driving+licence PDF link annotation
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/coi94onvtakqa488tmupp9hghr/16079827616.pdfIn PDF document text
    • http://greenld.com/userfiles/leburuwakomokevoreko.pdfIn PDF document text
    • https://grancom.by/upload/docs/madewimadorovokupoz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ebfc3cfc1---44810572996.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/reloxazugiwaduxizegodana.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/fuwetowemifutojuwigun.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609304c6eab6d---ripenope.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/xewokipujorakukus.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/tuborikijenuxugepivijafe.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcee327b759---tidofodedokaroxodepadad.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4e790cfe062ebe15d1302394c89a380a/jixutimewasudek.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161209568c8218---70238204750.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/10140133716.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/57268075383.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/pevosegur.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/58482412919.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b76bc95d7c---xabalitotadozika.pdfIn PDF document text
    • http://envigest.cz/upload/file/jilojegawuwizolelego.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/miwoxamixoxelitojokagade.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e340b7a0d2---49144585604.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/32371195749.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075024eb7ea3---18636388219.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/17173418112.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_off000143d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE9 19152 bytes
SHA-256: f1b05d635db1f4e878c526c211b39e710f782e26b3105fe1e521c701df405a83
font_02_sfnt_off00018d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D81 10472 bytes
SHA-256: a0139667632fcf3e997a563021726cf67786f8d54ef3d600dd6349a0b882a67d

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