Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c32f5fa6c0a2868…

MALICIOUS

PDF

83.0 KB Created: 2021-06-25 16:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6c284e8223a7629b24d7f76a6935048 SHA-1: 4d227b01d909532532a2a8849d4fee06293128a4 SHA-256: 9c32f5fa6c0a2868e301673c63b7484e212be5e5ee696663cc84b7f6208963de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=placebo+simple+definition
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba7237938---ranitumakubisupega.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd0661f2a---danelawe.pdf
    • http://adveotec.com/img/file/pewepamajasusipeterajuk.pdf
    • http://gourmethousemacau.com/UploadFilesfile///dunekef.pdf
    • http://jhferry.com/data/fckeditor/file///58866654831.pdf
    • http://bmsorganica.com/userfiles/file/bupijiwinuribiraxot.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f19ccf2470---mabomijowurozif.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e1e7bbc4f---ganuzogoxozewugekuvitiw.pdf
    • http://aklond.com/UploadFilesfile///2021050517432389.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0j55hddnkqjfbj5fmmdc8ks7qp/34357823834.pdf
    • http://extintoresorigen.com/images/editor/41584339899.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/79b27ccbca71899f00aa28ba630cfa2d/lomogenepo.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850c06a250f---25557681807.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9097036b3624d61a6fa5881489e577f5/51176334185.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0ff23e034---polupimurototozofifela.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mf5ndt802tdoi0pl9b6her02t1/lasarofiwususuzekabe.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_off0000e07e.bin
cda7f329852ab373a33a2355d821fed8af52ae3ece78444933862b2b0a81c870		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 10820 bytes
font_01_sfnt_off0000f933.bin
2b9c89f40c64ebf8a7104a974a54830b02c1f6a9b56f24d81ee7a641888d9510		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 17312 bytes
font_02_sfnt_off000125e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E7 16792 bytes

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