Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74de2ac5e6c577f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 00:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48101e3579ebe3f882d2c7b1a67442c8 SHA-1: 68691b18bc150fd64e03e2ff506fbdade59cce7b SHA-256: d74de2ac5e6c577ffb63d11b8eae9a4734052bb0147431277e74da094fee8699
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cructi.ru/uplcv?utm_term=gta+online+download+free+full+version+pc PDF link annotation
    • http://qdjshg.com/files/file/lawazofofawubelasexetobu.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/68587852088.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/60216563076.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/66098965550.pdfIn PDF document text
    • https://manenshop.com/upload/files/53130600363.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/27585976233.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/wixuluvisatatunixigalitul.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80c5a490d---gukoxi.pdfIn PDF document text
    • http://sinostandards.net/upload/files/6645225677.pdfIn PDF document text
    • http://orenprom.com/img/account/file/bukibijonemumagawiwitu.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/gopivegakarofi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378091982ee---fipomugodifulad.pdfIn PDF document text
    • http://1carl.com/userfiles/file/xakugofopesurafezimul.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/tafowapavola.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613577f8185d6---98669037521.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ifccpatm48trdsc6f1gq2n0tg7/45929427290.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/29191912942.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/72976950358.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/68027104994.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c95b17bfb---23103961692.pdfIn PDF document text
    • http://jawarakreasi.com/file/14012588816.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/zafapivumoj.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_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 10904 bytes
SHA-256: 30d6e88fd11d8bffcc1bf503ac3a5f014905b69953ec8187b0d396052b9d848a
font_01_sfnt_off0000ee35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 18612 bytes
SHA-256: a83bbb8fdfa4e91a33d3262b1bdd567bfa98e6a2e54191f1a51fbcc2ea4c7a6f