Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e5d459652fcfb5…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 14:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e3448bda3d76b626d0322b33917f875 SHA-1: d35acb5e0a27f6a0464831218046d9ae857abdb9 SHA-256: 15e5d459652fcfb5577578119f4f82964326a2a59b3590559d3e01b84ad3e861
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on disposable domains or compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=robux+codes+redeem+free PDF link annotation
    • https://dnmpaint.com/sdcc/images/file/83252178428.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/dozaseximewexirubipi.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/98524267461.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/jefebavisoziba.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/55723300278.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/21232349345.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5b91ab228849b616d675b8bce7c4fe71/12844868272.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/mawutudomemuk.pdfIn PDF document text
    • http://retrofotr.cz/files/file/88579579422.pdfIn PDF document text
    • https://khanikango.in/file/sorakesuwejiwe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175087ab6c---giwuvabuzumobikexerexe.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210905000302.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/49314571639.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137d91f7bc8b---13470765318.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/wefulowugoda.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/mobixejifanubekal.pdfIn PDF document text
    • http://zerosquareonline.com/file/27460591738.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86992b73c---xopapetijex.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/30597954162.pdfIn PDF document text
    • http://it-hair.com/userfiles/tanevavaronuxuramidaja.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/96942033648.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/69728231970.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/womuvazimimesasi.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/wapiv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 10524 bytes
SHA-256: 9f7b4c8a736c10c167e324df53bfc27ec1ed9b3b332b83c21565c97a73a7c7db
font_01_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 17508 bytes
SHA-256: dc30eec8c966ebeb73d8770789bd0119bce96083650bcf7f6274c56c8a4d9476
font_02_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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