Malicious PDF — malware analysis report

Static analysis result for SHA-256 380f3760bea262c0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 07:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f32835f33f3682a3620df337e71885c4 SHA-1: c52a1c5f8bb899cc0bcd0c44b41ec5b8a5f574f6 SHA-256: 380f3760bea262c0ba090c88254e210977aea0b22a8bda94bc85ecc8ca5d78ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The presence of embedded JavaScript suggests potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=unexpected+inconsistency+run+fsck+manually+linux PDF link annotation
    • http://jlsxjy.com/right/UploadFile/file///2021072202504173499.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe877c347f---61677255883.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ebce0352f---gijej.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/25915830842.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9475caeb16fb785bcd625ccc1ecf2e5e/zokigusonifoxipujenapobe.pdfIn PDF document text
    • https://t2sc.me/userfiles/fabuve.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/kabemetowiwa.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/73475416655.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/ratametof.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/24741222924.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/09ba1c07595acc1d9cb1985b5c0347dc/pomowozupazesazun.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/39073286110.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/widumosoj.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/xureloxuvudumiten.pdfIn PDF document text
    • http://allasclub.com/campannas/file/potuxogizujorid.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160959090490e2---pemixovelibafidek.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/45649344372.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/v22vti9opvj1qhl0ejo6sb404s/rigawodoliv.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080da4603759---32430042271.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/tejajufuzobudogojede.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb54e8db445---videfaxerawiguja.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/dfef86d9bb604583e147280c43a53ec1/26656978168.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/fitaw.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4dcb00e1---61592576532.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_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 11196 bytes
SHA-256: 07ea8531a043f0f48c2534ed4a95b0e46f177e12a7aabce23e7c9459b6733934
font_01_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 18420 bytes
SHA-256: ddeae2f4586fe45f83fec013cb47b1b32b7e4ace2dd4fe361b3f9f3ceb30b297
font_02_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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