Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b694d3d3163f52…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 20:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b57399230db52627e14b9e6890b10e42 SHA-1: f335d8198f29c54e35177301f075456e1c89bd86 SHA-256: f0b694d3d3163f52300d584ea73009df4e8f9e81559b3b54ddd2be240591a189
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this is a link farm, likely intended to lure users to malicious sites for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded URLs and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent.

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 https://queure.ru/uplcv?utm_term=coparcenary+property+pdf PDF link annotation
    • http://nanoscopy.ru/uploads/files/50595676169.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f36111832---kigenujonap.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/88422462443.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/47937882750.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/33778808100.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/24342443829.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/90702781520.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/nozerol.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/bizitinojo.pdfIn PDF document text
    • http://sial.pl/galeria/file/farapiberokolewa.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/55314841267.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/e69418f1ed052fef7efbc4d95f79a868/digusu.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607272f38fc34---gokitifobanezojuwegaxep.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vimixiribuvasabuw.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/61398368898.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b669a22adfb---59445648868.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e1eaa333---49194845448.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/goxazorukesemevo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/75062246783.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/wulelux.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/vavapa.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/68980295386.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/7642579657.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/85592116727.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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 17168 bytes
SHA-256: 5a6ed597cd29dee31357f9aaf38f02e6499d7515fcf50d14ae89a056b0adbbc8
font_02_sfnt_off00012112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12112 10452 bytes
SHA-256: 19ce756a50c7dcacfeef35aed5683fe0573aab6a535be646e94fdc01cdbdb4ec

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