Malicious PDF — malware analysis report

Static analysis result for SHA-256 108bb87bdff8c1ba…

MALICIOUS

PDF

95.7 KB Created: 2021-08-15 10:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81fa457df28c7d172255c0151daca152 SHA-1: f1dc6631a65ac358610d768f7a6e37f4c0a2efbb SHA-256: 108bb87bdff8c1ba6ef51bc77784047ca8b843fe61deafba78ab2c9c73be2d31
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=new+restaurants+near+me+mexican PDF link annotation
    • http://hong-tour.com/FileData/ckfinder/files/20210713_A7FCE73927F6B4BD.pdfIn PDF document text
    • http://biomisszio.hu/tmp/banopeb.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/99684619704.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/vikab.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5b1288d7a5ff0e85b13cf6ce0a3d6807/marozazapowubego.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779dad87d96---moditutenalositu.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/vodapojirijuborewodededas.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0de57d8c25313aa30caa72baaf8cb134/gizato.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/84984839056.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160861bed6cfd4---32490955750.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b0326ef5817b9394f0fcfeae874c3a8b/fanifedojexabo.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/73979366212.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/86891882084.pdfIn PDF document text
    • https://denimder.org/resimler/files/zironofawolimutatij.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcfa7167f3---gefuv.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e063ead3b---gutulux.pdfIn PDF document text
    • https://cet.sk/res/file/mujepurulibepusi.pdfIn PDF document text
    • http://le383.com/uploads/files/51869490871.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/95094629378.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/jexolupuwegatiwilos.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/8828898668.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/nisozaxugifiwisuken.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_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 17700 bytes
SHA-256: 279a810540acf535901a34ba052c321320b7f4a7cfa85160b3746e447263db07
font_01_sfnt_off00013e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156B6 10488 bytes
SHA-256: 028d276729e83ad7190ccbb22f5837aa195eee09c97a749bc5e74b7e19568d22

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