Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd14dde7ece32d86…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 00:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8dd533d5a2876ead7a30b25013926c4 SHA-1: 6e318efe13b81e31f76d248c625dc2bbac4da791 SHA-256: bd14dde7ece32d8657a7a101cc589c10f6654860b845fe99fdc019357763e8df
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of compromised CMS upload links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=aurora+teagarden+reunited+and+it+feels+so+deadly+full+movie PDF link annotation
    • http://webinaris.eu/ckfinder/userfiles/publics/files/kazijivexorizapajekuxo.pdfIn PDF document text
    • http://clingac.es/d/files/gudedodebunujetofofoduva.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/79796352300.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/xamikazusapilixugazojubem.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/56e27e1530e7a13cfb9a3dfbb5a32bf0/1021142735.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109060318126029.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/pajodazedediludigafenu.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/raromidobu.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/zagix.pdfIn PDF document text
    • https://mahae.hu/files/files/vopox.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/xizevu.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/kijufumofasupawukidarike.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/mexivaruxakalazo.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/pijamarifunurikafuvo.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/bilulodawuxurubago.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/40439378413.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364f97b8f54---82203047476.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/18211293486.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210921_A739EB280DCC010F.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/nebaxamawusunit.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/73518621863.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161421215ce2cf---1905451097.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/ropot.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_off0000cf3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3E 18616 bytes
SHA-256: 5348abe4ec5a640556981dfd86dc30aea9712a3a2ae15dddf0b128b07d69089e
font_01_sfnt_off00010016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 10956 bytes
SHA-256: 5ae140fd21a7eb8093f01ee8093604ea1a34160e8831261d88bb15e356aca498