Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a1024b4cd74282…

MALICIOUS

PDF

90.0 KB Created: 2021-09-17 22:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dfd5f9517e789c2c0f89732f1346f8d SHA-1: 177e24fca82bc66ee60aeb41b9e736934e844365 SHA-256: a4a1024b4cd742824555780a436653886c799fd229433413e93915a848e741cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and is identified as a link farm, directing users to multiple external URLs. Several of these URLs are hosted on compromised or disposable domains, suggesting an attempt to lure users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/42468773620.pdf In PDF document text
    • https://maintogelonline.info/contents/files/vorasewu.pdfIn PDF document text
    • http://goldmustang.ru/files/files/fozavepovovisokijokasali.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/kanesu.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/fowubobobor.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///mafugudifosetopafexilene.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/2031377180.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/23710962279.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/81205404959.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/99023278689.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/56957891097.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9ffp0tt4ap3inglqu1am03o266/wimemebowitaru.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/83660888459.pdfIn PDF document text
    • http://pinxedien.net/upload/files/84572938072.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/nabaziledeb.pdfIn PDF document text
    • https://vitanov.rs/files/22763314593.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/siromamugodag.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143646408deb---vukajivirogizugudazutopiv.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/pifugalunirebigudadavovat.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/pevaberekokexovugikoxe.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/94184488279.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/276b3e7567a7fffa77441fa52be22dea/30461890269.pdfIn PDF document text
    • https://birotex.rs/images/files/vewumiwixafapeluzupapum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+is+the+music+app+for+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_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 10932 bytes
SHA-256: 86e3bbf21fb1479ae17990b6c957a17b34ede3eccb325a82e6f38485e6e18077
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 17628 bytes
SHA-256: 67b91164e50bc5da3510d28007fc4f98e688debd9222d30c939da04adc7794bb

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