Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00b7fe2c6db6347…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 02:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40eed11a5f496fcc45d96ff31e471fe7 SHA-1: b882eac218045ae3c22ab80a0521d0460114af06 SHA-256: f00b7fe2c6db63477ceae745164584f34d0bda729fe151a22f2885e866c41abc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the ultimate destination or distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=gunaho+ka+devta+pdf+file PDF link annotation
    • http://meble-tk.pl/userfiles/file/39934337446.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/2591366101.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161242d4839185---17487017326.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f11db78b0d3---71962304401.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608553d92beb0---xelilok.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607742e395606---jagejexinobevetuj.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/47001991065.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/6651423055.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/dekerogumonetaxeri.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/36511738179.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3c814eaa---nezopavepud.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c37c768e5b8---tanejavoxojitaziraju.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/90085138097.pdfIn PDF document text
    • https://areicon.com/images/file/zoxubuvojewisoveziputut.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/maputum.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/sotobokebuzelebexute.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/84981962786.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/guwuw.pdfIn PDF document text
    • http://susutour.com/userfile/file/15298916074.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/66667402454.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607314d6dd455---86110541951.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/bobolikusazebimemuja.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/77494518711.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/pirisotepijixegupevasof.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_off0000b959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB959 10624 bytes
SHA-256: 2a4896b6c2fcdb02899a18690fae6daed070b8b3ac277aab9b716f2823bd107a
font_01_sfnt_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 16376 bytes
SHA-256: b638327476e89a56ea8c0cbdacb3823e6ec1ff20528725c71ad737cd90541157
font_02_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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