Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9706adf4132b012…

MALICIOUS

PDF

79.4 KB Created: 2021-09-19 14:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d50305a3c51ba5bde48d4d212f3337af SHA-1: 4b69a50d9e173e6943bffbb664a505188daa0e34 SHA-256: d9706adf4132b012cbafeddafca45907e539e62f591669a47f9427e1ae3ab663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm patterns further supports this attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=ullu+shows+download PDF link annotation
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f26dd1172---jamab.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/25574236013.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/74108794196.pdfIn PDF document text
    • https://razredna-nastava.net/files/kalulagolowarakus.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/vuzojoxi.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/sovalibogegipo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/26c7731111aa3c9a3ddce6fbbe7d6a86/89074889632.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/86630379242.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/zelebipesozov.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ce0a33b84---mazizumazadi.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135514866a81---51299734634.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161428d0d95669---49402652911.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c48140db8a---81044254178.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309160bc3d1---2348025664.pdfIn PDF document text
    • http://mqskin.com/luutru/files/33649158472.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ea7f9e3612e5629ed180d6a5c99854eb/kupigijezetevozebonuxepu.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/pudewukudonu.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/16747079061.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/41347534145.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/tazexabolo.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/gitefo.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/peluxukunumodovu.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/nagoxezovi.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/38839881980.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/penorosavuxika.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/wodufog.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_off0000d460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 17236 bytes
SHA-256: df71d5db9bb2a6840541698aeff0f08ddfa18afb77d5538f9d78f31089290ff5
font_02_sfnt_off00011913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11913 10116 bytes
SHA-256: 7d0c548b6856aeffd9cda3d1fc916fbee2d826009b5197d206d6573a0783e9de

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