Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd5d16a384ee601…

MALICIOUS

PDF

75.5 KB Created: 2021-09-13 23:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 703f0eb28f10ca00a9d6652a3b8af1b2 SHA-1: 504e04877d3eaa1585be8e3832cc2d6a19a0c868 SHA-256: 7cd5d16a384ee6013c54446ca516dd484fadb2d6316a8253969c59685a56095e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure indicate it's likely a lure document, possibly attempting to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://niezapominajkowo.eu/userfiles/file/9239386094.pdf In PDF document text
    • http://studioscoponi.eu/userfiles/files/97325613324.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/wulozafivoropewixonageb.pdfIn PDF document text
    • http://reflita.lt/uploads/files/pukimerakuzik.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/nexawozinapoxawogebu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8091b0d1c023754b2f497ec081b094a2/wuwak.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/rowakow.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///25553302108.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec5089866e---wafiduzozatonogavejuj.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/26889229370.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/rusasebegekovebiworo.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/vefiko.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/larifozeburupabofobo.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/kugudepewokapo.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/4063275240.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/57297614340.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/96397117177.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/020419548012.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210913081103041698sla2w.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/9876a45b522405398e08358dd0987376/goxape.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/74740277062.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/41772374036.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/xulegod.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/sorutobevudukazujitajok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=change+app+permissions+android+rootPDF 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_off0000c419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC419 17172 bytes
SHA-256: 67ba951074df58a7cbaedb33d9589afe8eb1d0017247c61b408184dff861546c
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 10824 bytes
SHA-256: b2354b1b1b52e24e97e3f6d5ef22b38051a731b434efef9b0b86f4f1899f129f

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