Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5026afa77037618…

MALICIOUS

PDF

78.8 KB Created: 2021-09-24 06:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43924c48e66894949ef1fec6a3a58bb7 SHA-1: 42c4c486d6b0bd2c65ef0ed492c8c2fee07763a8 SHA-256: a5026afa7703761823995c25f6fc67aec4af3c7f22c434bbfc83e77ec1e06b69
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. Several embedded URLs point to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to trick users into visiting malicious sites, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://wastran.ru/uplcv?utm_term=modals+examples+in+sentences PDF link annotation
    • https://emartdeko.pl/galeria/file/28879431569.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/43938296559.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c73d95ff82---rubaxezizobuwimi.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/tasifarawubenebodomuf.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/86024326777.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/3599043425.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613575ca3cf65---75099485294.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210905092957.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/najakuvodi.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/xonalanuvoguz.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/12677155333.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210908051133.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/73669875100.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/372d12b2a993473570bb09da6ed564a3/2081791299.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210911_17098EAC3A572613.pdfIn PDF document text
    • http://anm-av.de/uploads/files/timaleg.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/dudunovat.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141912f94344---loguvurusevakukizusazap.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/52173531646.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/64402257634.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/88214208904.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/36029780359.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/59098444450.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/tizijemogup.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_off0000cfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 17756 bytes
SHA-256: 4b8e230d1de168b10b265b26ca9c80d01bcc81e5bd5df49575b6453b42a702e8
font_02_sfnt_off0001154b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154B 10672 bytes
SHA-256: ddef8428b58df336c1b9701e7a3cdd8164e588787aac31f07170ffddeccf7501

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