Malicious PDF — malware analysis report

Static analysis result for SHA-256 a798d6dcf452a5b0…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 22:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 46796316ae6388bcdf43419be58304c8 SHA-1: 014624494b44f3645c6461fb78efdfcf05917854 SHA-256: a798d6dcf452a5b0f9e42b6cefdaaecf423841e7db9a5476188d392444b8855d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. This suggests an attempt to manipulate search engine results or redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--49s538bo8ux8c.net/userfiles/file/povojofuf.pdf In PDF document text
    • http://jawarakreasi.com/file/linenigifexevutuvumegu.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/45714032228.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/zigituwatumikibadexi.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/nidejemodadokipopisaf.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/kugizavuwevodo.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/42d5429ad0927e098b6bee6e1a9766af/18925240294.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/zojuziforarukazisinifejut.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/63336577776.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/baxiwuj.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/rafipabonexumuzigej.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132601328962---kadan.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/f8okcto80icgcluabjc3rg2i2f/3117317731.pdfIn PDF document text
    • http://marymo.ru/uploads/files/nugogulu.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/612f8642b95ca.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/pepetesikiv.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/jekupoxogozabilowumuxafez.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/dowexanajokuz.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/55305426932.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/vogis.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/sipenunusipemesavekiwaju.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/97003974478.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/1530138297.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420cc338029---62473343751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+access+your+voicemail+on+androidPDF 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_off0000e605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 10888 bytes
SHA-256: b8a4c781ebbe82e46a421c820ed87aff6f5ab21a7ef57ea52943148f0526da3d
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 19208 bytes
SHA-256: 4026e5ffc0ba70ad4ed162f372c7dbce3835c51153dccfa5053d268d00b7b2d8

Open this report in the interactive analyzer, or submit your own file for analysis.