Malicious PDF — malware analysis report

Static analysis result for SHA-256 80aff1f232625e90…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 05:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 586ab7956548396a0cc9e8b1d8a61c37 SHA-1: 990f66bd0de0d6146a7184c343efb0113250fa11 SHA-256: 80aff1f232625e9083c1dc13c1284ca4ae9d1660e287816b0b693c414f881279
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=unlock+my+pattern+lock PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161385e4e5e705---40813823629.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/96909655784.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/9756054698.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613565504dbe7---47144459592.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/79847561882.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1683872155612fef3d225bc.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/lixugu.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/91868763522.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/feragafanogukusatewol.pdfIn PDF document text
    • http://jngf.cn/files/file/21835878559.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/63745791875.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/lebopugew.pdfIn PDF document text
    • http://smirna.pl/files/file/bepot.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109072023502916.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/95388864796.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/begefikilixuranu.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/wuwedalitinojumesi.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labejiburu.pdfIn PDF document text
    • https://matricula.arendic.cl/files/26720820350.pdfIn PDF document text
    • http://skncn.com/u/files/88950299831.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gibebevoretixewulaguzu.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/nuzumim.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0195aa7e---17724354918.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zadukerutomuludemigujep.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/45084218732.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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 10488 bytes
SHA-256: 9c608649f961512f8c0f437a81e4b229a978ddd8294c6cc79c31ac7d83bdcc0b
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 16240 bytes
SHA-256: 38728c95c9fbe027809f8eb01e01d5eaf1c8d9c4623af9fca22cf6ebf28e4ce7

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