Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82499f8bd700026…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 14:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4b577dfed368ac336abc2e6f7262ba8 SHA-1: 3eed0b57f8ad022cc96cf802b8674ab7fbf53739 SHA-256: f82499f8bd700026741e05c1c41efade88b1f8b9eaa7735f6e0c61aba18ef04d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://huntic.ru/uplcv?utm_term=deadpool+2+gomovies PDF link annotation
    • http://cafesca.info/ckfinder/userfiles/files/jugajilom.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9b877360---48354237626.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/77496072704.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/4056100231.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/depidimazekeju.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/uun0nmfotk8vggb5hc2ig951ao/lixakowesujifozuvopabowe.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/21327033414.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/6267944439.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/fotuxilezobaruzolokatonu.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/surs2cvccc31sggrlq3foftv1n/potifugagabuw.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/36836879407.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/norunumag.pdfIn PDF document text
    • https://mavibusiness.it/file/musopamomug.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/38976170784.pdfIn PDF document text
    • http://dentherapia.hu/files/file/nakovufusenumuzozodag.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/todirabojimalovatawewole.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210910231726_dbryxx.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/davugibotejonizegotaxub.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zobabifukakanozo.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/6925403137.pdfIn PDF document text
    • https://resicolor.com/upload/files/11124393501.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3a45dc1---62613647594.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_off0000b6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF0 16848 bytes
SHA-256: 19286a358d6d9ff67fba072214ba1c61025dcf0000677130727608f1845e6637
font_02_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 10620 bytes
SHA-256: c992d8229eb9035d167e1a7b05b3a79cd44745738476fd2c0a66a7901e540bbf