Malicious PDF — malware analysis report

Static analysis result for SHA-256 950974e3a90d5b8a…

MALICIOUS

PDF

125.3 KB Created: 2021-08-02 09:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10cb449cfdb46c9b2c27b40864920a9f SHA-1: 0ddf841a300c3703ea1664abb76ad91824a1765f SHA-256: 950974e3a90d5b8a09473ddb5439389496f6b34157009049a636cb4a8fe3fb9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document's structure and URL patterns are consistent with a link farm designed to obscure the ultimate destination and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=que+diferencia+hay+entre+educacion+fisica+recreacion+y+deporte
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e5e97325c194ce0be40f24402a4e9104/67835218160.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/82d6a5c2a12bd8498f7d08f7a72d63d6/53218399769.pdf
    • https://bamfieldrental.com/userfiles/file/viwigufowabojizupojapoz.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/85110260959.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cp1rqir3qnk3j0rq1s50dqrhs6/59058704339.pdf
    • http://innotack.com/userfiles/files/tajolavubere.pdf
    • http://tokstar.com/_UploadFile/Images/file/numakabofevupopaxu.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/fuanhv3scj74s7d1oir2mv28b4/zuroxerugubaku.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084619f57519---62923335910.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f76896c2c33---xibisidolipigatasubewuzam.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f0390ee859fd5cf845619778527f3e88/xawexe.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/sawukofizakosadiwuwago.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103f3a5465a7---31560559441.pdf
    • http://wenxuezj.com/images/File/vufugidanokowusipixojenov.pdf
    • http://sartoriaventurini.com/userfiles/files/fudakufozefexizafe.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d32f2147acd---xanogivuwitubolefakeresu.pdf
    • http://eurekaelearning.com/upload/news/file/kazazezuradaxovem.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feqlrb0ib22he0jlm4qj1u6te3/79373692530.pdf
    • http://benrassam.com/uploads/files/36840488741.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0d5402fd60c6e94fcb2c34364803a56c/gazizevik.pdf
    • http://bluelakehomestay.com/uploads/image/files/fikuwixaxatu.pdf
    • https://mediaget.com/userfiles/files/90952893734.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018475.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18475 16792 bytes
font_01_sfnt_off00019c87.bin
179873633c59862a46b140e3cdabe75ad6a4a738ee8784691c635bc4577e6ffd
pdf-font-stream PDF embedded font (sfnt) at offset 0x19C87 18292 bytes
font_02_sfnt_off0001cac2.bin
58d967c5e3730d9f7379d0d3964d4432f392a825dcfbd1efda2885299e095790
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAC2 10944 bytes