Malicious PDF — malware analysis report

Static analysis result for SHA-256 222b8d5586a7950a…

MALICIOUS

PDF

74.2 KB Created: 2021-08-06 22:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c0bf9ea6bf14c574fee297b284a3605 SHA-1: 5b95acbb2ca0c294edabb489844bfb564377e817 SHA-256: 222b8d5586a7950a7778ee085bd1b85f737e3bd3d4d611b50f4e2302faec4ed7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which are on compromised WordPress sites, indicates an attempt to obscure the final destination and potentially distribute phishing content or malware. The embedded JavaScript likely facilitates the redirection or execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vp3jm581qpp88th2lb3geknotc/repolojezikudoj.pdf In PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/dapusoririwekepuzegobukuw.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff9110a4d---pozowulokugoriderexesene.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/pelibefekaketisu.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/74849035767.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/10647212663.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/32809601570.pdfIn PDF document text
    • https://petikdaun.com/contents//files/lowujofati.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/rojiwokexibubani.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dead886232f---39468279208.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/vusup.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/vetugebodima.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5c767b55---rarav.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/cb1c0a192f7b1f864269eb305de936c2/bisikuxedak.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/jefedubinidusudimos.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098228af36a8---xoxujekajigan.pdfIn PDF document text
    • http://sushi-belovo.ru/files/34616060993.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c903d5aa23a12b82266c6539fafe8917/47642006511.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c033aa58ec1---94581606416.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/binesenizenutamulubadupe.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/sakipiginopuwirote.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/u9bpem9uri7149pvoqskek99t2/54493262043.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/kusozeranopaborenowen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=libro+de+formacion+civica+y+etica+tercer+grado+pdfPDF 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_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 15236 bytes
SHA-256: 6ab70ce5fc04e6759014d289ee7aa4b2217e85a435722a3d93f364d88c5b8d6f
font_02_sfnt_off0000fe8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8E 11024 bytes
SHA-256: 6d790715b8ad3e8dbdb592d0203bdbbee97f86cc1625cec2d7276664a1fefbe1

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