Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad6b57a11877129…

MALICIOUS

PDF

80.7 KB Created: 2021-06-06 12:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9d3f3867a67113bfdf826af5f1c79806 SHA-1: fb1cd969372d67ce3fb34109e5dce0876a459d80 SHA-256: cad6b57a11877129090ff07c519695f138c7bdcfcf7c1c5b1b25b1f8cf97f724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be a lure, likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=causes+of+war+of+independence+1857+css+forum PDF link annotation
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160805d18be33f---nelibikamebirutiror.pdfIn PDF document text
    • http://foodchemsino.com/d/files/wugexufa.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ac4ec53d---mukewukedivin.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510135394342.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/df68677f408c8d8c3efeae5a0c11ca4f/35470905251.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756d12035ab---dufiwusisogokotekilewexad.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0a1c4d8b---zewarolatagabagovaza.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/20752080993.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2ce297a69---61599077120.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/budelal.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/liwipak.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607355d8dddda---15266646102.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff2acedcd---xobujexosodijo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa799372395---88720620559.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/panupilomesukuzot.pdfIn PDF document text
    • https://memoservicesrl.it/file/66377501549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/tekutavawakike.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 5716 bytes
SHA-256: 1071e345ffcbe986ccf60c8ec0f1651e1cae6abbf37e816d976a85c7a460a9a0
font_01_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 10424 bytes
SHA-256: e0c54fe9d4ec14fa2bf5ef4087bcf4a2ad15bde025cef1256317db0155ad09a2