Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb882246a8dcd978…

MALICIOUS

PDF

121.0 KB Created: 2021-08-09 11:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 454c8ec7e040fc14709a7c48e05e859f SHA-1: 98a226479aeef4f205a85fe24b786d8358a2a554 SHA-256: cb882246a8dcd9785e6865b4d85f271e7238e84a006c72c9aa2096cfaa3f087d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836bc8af005---4400547617.pdf In PDF document text
    • http://test888.org/uploads/productsfiles/20210706081219_25cb8.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86bf16748---fimanodegarenorasavape.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/36c3b2844590441eb6b98899456b57f8/92379406592.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c57acf3b385f415973595afc252e1984/buganizavepejur.pdfIn PDF document text
    • http://jkohut.pl/file/rusopivukuka.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/lamagejebomelisizir.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161108dd0c9c49---giruwunuz.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/79893875659.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53330f816---31208650536.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/latanef.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uv46q92clltgf9g2v0g4i1gjoj/59015682984.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/danivexunokomobo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840539c19a8---pevomilela.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/88797978511.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5b265704f879abc050abc0750258ac1f/warodidojudulapulavek.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kedojevimamotolovelorip.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/bupurasevamomofukefumema.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fc8dd48ba---kivawuzomudexabavetepemug.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/5944921113.pdfIn PDF document text
    • https://paperland.bg/uploads/file/88392386760.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zakexojebazaremugibenof.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/48995944165.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hull+house+short+definitionPDF 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_off000176c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176C2 10380 bytes
SHA-256: b3c2a0e207c4ecccc0634b16cc1bd3f63b037cb88508fc0de0ec8a824f312e45
font_01_sfnt_off00018e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E1F 17780 bytes
SHA-256: 5309c0cb03e76dfbcaa9c469cc427b215d7455804d16e0332f9fcf59d2d40ecb
font_02_sfnt_off0001bcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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