Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51ad6ae3cd00318…

MALICIOUS

PDF

72.3 KB Created: 2021-09-27 11:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aba50f4ca803b9ccbcf725c1e8bfab31 SHA-1: b7453e8af9c807eaf6760792286ed960bd7f9baf SHA-256: d51ad6ae3cd00318ecd7429d34fb78a7410e7edd11187d4c5c4f8e59e9c26247
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://arebiatours.com/uploads/files/21907528351.pdf In PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/68520866231.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210910183628401590.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/96587706917.pdfIn PDF document text
    • http://dongphat.net/upload/files/57611894755.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/somosovesalof.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/xobogikigugowus.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/gizotopovanu.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/wixuwix.pdfIn PDF document text
    • http://annabarons.lv/files/files/lerutufomexekuberupo.pdfIn PDF document text
    • http://webs123.com/userfiles/file/39493020232.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/scudrkm2atm2o3g9nphioq4255/6391405936.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/17182574133.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b9cfb8347---24938842444.pdfIn PDF document text
    • http://schturman.ru/files/files/92126778242.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/kewogavijo.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161401e7401dbc---99450771097.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/wokow.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/buzujepaxiduwizu.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210924064942.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/1352314973.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/rakuragoxuduwivewowekaj.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/gojanegugigefo.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/dizuv.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zagafukarurizerovufas.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/39ac863302bce9ac52aa8652f81e7088/12878740739.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006497d771---perirunes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=roland+barthes+death+of+the+author+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E7 16544 bytes
SHA-256: e648f23cc8e39f0aded12b5f194ef920002ca2d80d9d8cfb6efddbf455bfdc64
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA59 10788 bytes
SHA-256: 24705e1fdc1b898330e6e7875b566e17a460070cf1ccdb1526c8640f61a6ca88