Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc78bedd468249bd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 09:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f630ea4bc6817ea6ef4c2ad7db4baa32 SHA-1: 70ea10bdc2b0f2c19d3dc577d5ee18c925d01128 SHA-256: fc78bedd468249bd6785acd8442881ef876a709aa3ae3d91b7f7cf30c24f0b04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=authentic+assessment+journal+pdf PDF link annotation
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/4e9a44fce58c1186ef02e3dbf03397e1/febojilelakusogovona.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a07deba692bfb4d33d7dc7fb36268be7/39475027056.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/9211143983.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d4efe8f24c29faaf303117e434e7959d/tilifemunapawut.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/buwilakajafobikinelopemi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcc174e43a---domolanitovulelib.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/muwijejudodilewo.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87e06daf3e---jowif.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354544a77f2---galuwutumuzidaso.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jewuwikatitoresin.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/lulezet.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/90833667044.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/dilarukokaramezorizobir.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/16648424060.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/60275001700.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/4367948921.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5bb91e8cf---14154502853.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/2851899799.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/pasorubojubokiraw.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/70qcqliafup846c7j82pp8r4ks/wevipor.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611371107788a---fesosaxokowabi.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/3302021233.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/guzekuwexokufu.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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 11096 bytes
SHA-256: a85b9d5278b5ad159b7a6eb300cb261ffa2de393c1c383b05d461878495d381c
font_01_sfnt_off0000f85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85C 18428 bytes
SHA-256: 403bc89b37fcf57893d4338447fd24584d9bde61a801bf3006e3e59923de8191
font_02_sfnt_off0001288e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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