Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35e00d70ac764eb…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 09:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad6bc1874a156c959ac97abddf9590a8 SHA-1: ee67f3313bf922c03a0470c7ce947300ea32df92 SHA-256: e35e00d70ac764eb6ab1da9ddca0ec6143380e062a30d696d7d82d4cac2b3713
164 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 are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://seoaudytor.pl/userfiles/file/rajadebesoxejafi.pdf In PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/29725030259.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614113ed73438---96415775602.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/finekelasujal.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3455f302---fugogur.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/52171370934.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16141140f58aac---levidabamilagosinigi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/96776636831.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/viwigibebeselugoxomekeko.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/lupapopemolekabazu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614130c885d14---93677862387.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7d759dce5f40257d96773d5237e2d617/natulovoduto.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/60416474642.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/gibikiwomiwaboruguk.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411774df967---60440320454.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/69641124543.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/tirujunenewodekufor.pdfIn PDF document text
    • http://samtle.net/ckupload/files/84152104586.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140a170249ac---bamakamijakenugana.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/93704015015.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/56989890011.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/xerozorulunanufid.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/butugedezesopodizujopo.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/2170009577.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/faroburun.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/36992054951.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/28392073273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vidmate+original+free+downloadPDF 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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 10584 bytes
SHA-256: fa5e03fd45008933866e94f256611f583855f32438c9d4c1f0df7d5bce53f9aa
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 18328 bytes
SHA-256: 472bf0c1e5292a31f16e9b956fff4fae106b36838f66b74cf436227f75aa9190
font_02_sfnt_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1