Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bc8718cb75059a…

MALICIOUS

PDF

102.5 KB Created: 2021-06-27 00:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d250cc9d35632e25b181afb969c7512d SHA-1: 950be19a74558703c7210747c530cf99e28623b3 SHA-256: 14bc8718cb75059a1e0aeb17b32a6f590c3149df91f4c21056ed073e86f67253
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the distribution of malicious links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://dnepropress.net/files/file/jizewaranorozitugisile.pdf In PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92951a3b6c---10445638951.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/su7qqc16s07ik7k6ku68v777i3/bemetu.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/20231394939.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/19816513103.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/31338958843.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/30345465650.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cdf7dcfc---92442971628.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/58843087aa29c3e3a8d553a851685c1d/mufeli.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/45fa8af31238ef5cf9e700cba2d6017e/50511071578.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7212610eb---buniroz.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/1db2cd1b15bf1bbbfc5b0aaf2b03cc8b/27217179060.pdfIn PDF document text
    • https://senhewood.com/d/files/61066299619.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2l6jbs74n5s7t3ibvvek42mbs6/sopidukunup.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/7562290208.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xunezerumuvanesobi.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/40423856870.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22c573291e---nugedisukizatiga.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8452dbca4---63128118348.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/worozipofomodizapuw.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f0d19b96---46065731551.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ea799ca4c---bokuranabizobegag.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/a443fe5c6ab2f455473933372ce379a7/dobixevevuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=all+in+one+maths+class+10+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 17788 bytes
SHA-256: 3151e54bea462a56095f40f812a6d775dd1b142ee7600aaf4efc19bc138181b8
font_01_sfnt_off00014618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14618 10648 bytes
SHA-256: dd4370823c754dc4d5609f1703df2ccd3fb6518f47678e6fe255962446503ec8
font_02_sfnt_off00015e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17672 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7