Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2fa1878abdac4c0…

MALICIOUS

PDF

90.6 KB Created: 2021-09-23 05:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a09d603d08220bf0e612378ad2c4caf4 SHA-1: f49157703c46335bbc807ea66ce46ee80e06ca64 SHA-256: e2fa1878abdac4c0efb9c7de941799f53ca18383149e9fba67a9a10351670592
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to lure users into downloading further payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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 http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a31c75066f390b38e621cb766e36e3c3/65965845747.pdf In PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/17564792837.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/61335016422.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/72069805330.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/145505da43465f41278d76ab8e46bea8/16889947443.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109061320043536.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4ad2b4c8---zirux.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/191355103463.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/bawogipuxibirobizemav.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/tovuxavevowudizodowe.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/60362510739.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db8d93cc9b---34077155385.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/roporizuwejunuvakevur.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/44005464202.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/poxozunazux.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/pewot.pdfIn PDF document text
    • http://cocoal.com/uploads/file/besatejigadugenu.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/vujuwumukevofavi.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/23552559253.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/tudikugijutirojufije.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/jubadatebalemijokukigova.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/rigiwamijiriviramelaj.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/safopigo.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/79997724381.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/28110739585.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=iptv+recorder+androidPDF 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_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 20704 bytes
SHA-256: 060435982800237d31be12cba8a7de711c7f0b8064fdd3c8c649ce54533b80fd
font_02_sfnt_off00014589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14589 10312 bytes
SHA-256: ad2ef112f24217a5d38113756014d936f454e29a13448b0065999dc3bc3c2dc5

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