Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b23d0a735621ab0…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 05:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37f2e2a672ce755239ac56b30afdff2f SHA-1: e19dae7040c51c51f803bcb1ba26eb04cdb2c63c SHA-256: 1b23d0a735621ab0e8f912e9f8546031b85a7e56ef3f2a1e80ff9384d5680e18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. This suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://huntic.ru/uplcv?utm_term=central+elementary+school+website PDF link annotation
    • http://local-minicab.com/survey/userfiles/files/38151100991.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/sifoxeranuzumibowepexelot.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/26057122974.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/wigogigawetufuliwef.pdfIn PDF document text
    • http://ctm.it/userfiles/file/podumalamegemobitasobak.pdfIn PDF document text
    • http://imaginove.eu/data/Files/22053555045.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7e1750529cbbb98b8faa5115c1f6a814/jesaj.pdfIn PDF document text
    • http://marymo.ru/uploads/files/pugejazepevidilubupomi.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/pizebonebobefejak.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/gizosufipagemuliro.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xawurovu.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/51878086581.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab80d68d9a8---towojunurivitux.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/wotabelutifivonir.pdfIn PDF document text
    • https://ecoretras.com/file/tefipob.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/49244703682.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/1ne5btd08tuj97rc429coa3g8l/31474910461.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210813_287B935E2C07B062.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608966d6eba3c---zovevum.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/saviwiririnuk.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/8311176961.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eo9275i633ulh9fg67okvcq825/55119022678.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7842decfcb---93251080929.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/gegopetek.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pegudomigir.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_off0000ce11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE11 10868 bytes
SHA-256: 04c949c9f5931f861292ddfcd360bc46e4e0da116e94a094a51580b3f15c9173
font_01_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 17932 bytes
SHA-256: 7eafc143715efc3bc9aeebb2ac5d1a2cf080da516f8538511757e2881b533f78

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