Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dbf12392a173e4…

MALICIOUS

PDF

70.3 KB Created: 2021-09-17 13:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b46eaee183a8f82f7b69ebf5e99ad53 SHA-1: 7748a3e6ba926d408ceb352a3847a9c0c565c5d4 SHA-256: f7dbf12392a173e4ca4fa7bef6d90ba3c5d6468f97839f64ba764b2e3c08fdb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external resources. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

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://oniceh.ru/uplcv?utm_term=apk+to+bar+converter+online PDF link annotation
    • https://loonbedrijfschimmel.nl/userfiles/files/kutopiwuvalover.pdfIn PDF document text
    • http://indexone.ru/upload/file/2834274095.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/fmi52aurjonhvi55ikv69nd4kf/godijadufojapoparidilavi.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/79052060885.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/40314795522.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/mezegedisivinil.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/16632546647.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/luxafedawosipufadidudase.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/tulukovekusodi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140531ab1ec5---8406606476.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/maxoseta.pdfIn PDF document text
    • http://moretonassets.net/userfiles/fatimobidukixa.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wasomopanibonepubuwe.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/selatomufekogavonuxikibun.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/degarom.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/solofubi.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/tazilukemip.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/84506177598.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/pudoteb.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/texawaforavuwunonuf.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/selokuwewaxiled.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a071f198---kexiwadetonini.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/wuxerebakuvupoxuviwafope.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_off0000b104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 10480 bytes
SHA-256: ddd0cdb75261814d89bdeeac3657a0e2b5331a69faf2d878073e882a5e5ccffc
font_02_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16716 bytes
SHA-256: 0197daa21eba2b0fad8fa5bf533c35c57b790bda07bb0c36cab8fc05cc97e4ee