Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e30e70dddbf2a89…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 04:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8c1d8cb614a0c286ab70ef4ac45d7d2 SHA-1: ca818e76011d54cb7eae2d4646e2a30dbb91bf55 SHA-256: 7e30e70dddbf2a89e574c0535209e5f0a85bb8f144efcad5b23b5dd221c143cd
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of a link farm and compromised hosting is sufficient evidence of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=big+english+2+teacher%27s+book+pdf PDF link annotation
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b4882c7a4---39007349543.pdfIn PDF document text
    • http://ahchala.com/img/file/72963012394.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703df4a8b1d---femurukomerupebu.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/eisjja77iepfvf3i1g87lcjset/mafuw.pdfIn PDF document text
    • http://rld-carbon.ru/file/majanufuganodorarodupasis.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/sapuruzixukegojirutuleder.pdfIn PDF document text
    • https://akvaguru.hu/user/file/72513831183.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/3c58c713e5578120cf2547e5d0a0986d/kuxiragabinexesufodejep.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/51968745808.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/golizipuvikewukip.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/poxadavasetubegobetevaro.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///nomumegegopemid.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/metalipasuxajefenisubi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae6df0f63---57937753236.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/gilupitexidadezusiwarav.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/1102940794.pdfIn PDF document text
    • https://noventa.cz/media/files/file/18810337205.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/93631567757.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/56f2780dc5babb85c3833e2ee90dd3a2/xomasudatelutozug.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/99346093568.pdfIn PDF document text
    • https://mlspoland.co/files/file/41787580406.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_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 16904 bytes
SHA-256: 25497012a4d84acecfec9848759e0d397ffc58f5b2cd2906dd10910953f354e2
font_02_sfnt_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 11340 bytes
SHA-256: 6d864e4ed1e4d644799a9801f3bd8b77a413d28dbce99ffe4ee0c82291b71f1b

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