Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8abbbe139941472…

MALICIOUS

PDF

95.5 KB Created: 2021-07-16 22:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d821e18bf1c6f95499d3e7f9b2490fe1 SHA-1: 89cfdb049f738ccf8109c3d68d5b601c488636f8 SHA-256: f8abbbe139941472d1cb84b3e612aafa84ad1d26d5bcaf0ea147aeda6f1d78ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains an embedded JavaScript stream and numerous external URIs. Several of these URIs point to compromised WordPress sites, specifically targeting upload directories, suggesting an attempt to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f052378052a012769f608b0b9eaef9d/16481464132.pdf In PDF document text
    • http://sincaremedicaltour.com/js/upload/86120972024.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/84016165314.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/51032460497.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/tenuximusedaj.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66563395228.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e66f56340---81784311491.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830486cd4bb---dazefigozufodiwatimez.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3d38b789fc1ab0a65e95b393201c9b63/9131791580.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/36d818fa361ede448cdb284d5632c140/piwibuj.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160727f4978922---ronerojolanazezitetixe.pdfIn PDF document text
    • http://chapelguild.com/images/usr/mojowadizoredurejez.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848888f0d29---xokufevuvelonu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b04c2f199fa---55215403393.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8vdj3onlkfgoklfcj6gvmnrhjs/50834908771.pdfIn PDF document text
    • http://hydrem.ru/images/file/pikinevofigopaserepagenam.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/206b885a33b7ecba6ca596fd1eb007d4/veputewelum.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/63818415827.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/nasngalfev82tk929ieesae8pl/soremifagefoxene.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/wavisonum.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/48970184491.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f70081653---gokuzogisoxi.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/20109167330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=team+manager+interview+questions+and+answersPDF link annotation
    • 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_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 10908 bytes
SHA-256: c24c2f988204c44afce47c345b01b3a7a8c5732d9a3fe3ca27cadab35daa33e1
font_01_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 17672 bytes
SHA-256: 055bc9643d4bca98648423114392ae2826b4bf6fd0bd682a4f4cfb3de6b9e279
font_02_sfnt_off0001587b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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