Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b7e9dc7e37bd62…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 05:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbce630d09c6d01b8334715bc214699a SHA-1: 7f228c8576d4717eaeae1db4a9e89defccf9cd53 SHA-256: 06b7e9dc7e37bd628c7c02d8127d07f17f95a02fd822a0f35011c8d48e5f78df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://irlanc.ru/uplcv?utm_term=vpn+android+apk+cracked PDF link annotation
    • http://eia-edu.com/userfiles/file/24632919882.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/kejipafedobon.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/51229197947.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f66ee3b1---85297757687.pdfIn PDF document text
    • http://teknis.it/userfiles/files/65149549612.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikepab.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a9435be2---jedirawibozemudex.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021931352266334.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4a02de2be6e1da6089ba27db63331852/nupewejupiwada.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/pesaso.pdfIn PDF document text
    • http://ned.ru/uploads/files/zurofamir.pdfIn PDF document text
    • http://stringladies.cz/userfiles/muxenebabafulakokizomoba.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161310e34db34b---41126190082.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/fawizunirewo.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/najamiriwefekaxuzibo.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/25407385686.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/73615300356.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d4d03ca49---jefuribitatamav.pdfIn PDF document text
    • http://medi-sen.com/files/files/35218914139.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/6201907168.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/dcbbd065ca09217da5a9fa47d73637a7/95797879957.pdfIn PDF document text
    • http://szcftz.com/upload/korekagiv.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/7800333122.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/gitewad.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/63647022293.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/vamobok.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_off0000ba93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA93 10256 bytes
SHA-256: d0f30f16d6339d40bca3ea23b0e4dfe184221ef88e9869728df25c6dae046763
font_01_sfnt_off0000d1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C3 16300 bytes
SHA-256: eb82e67a0eb89a4e01e64d5f27cbf2cf58e70164571f282c624995a3642218c9

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