Malicious PDF — malware analysis report

Static analysis result for SHA-256 60bb38318c256d43…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 08:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 343766768a1d02b6761ffecc037a1661 SHA-1: ff65b420a73159a714e7f6cb78cdbef3ba36ac08 SHA-256: 60bb38318c256d432ef497d8238cb8be644b09a84e54ad092253795d99891c3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=american+pit+bull+terrier+white+and+brown
    • https://soechi.id/userfiles/file/puvefuvuvi.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/pujemetunamupivodaba.pdf
    • http://andlupa.com/userfiles/file/mojujowifeta.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d545058ec780b0f990c705d7ead51e21/vexepidomegaz.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/a5g2ls7oi6usc9au2fqvcl5uth/62922379481.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612da2247dd24---21125776939.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/92487133065.pdf
    • https://alternativecarrepair.com/userfiles/file/godixisutuvumexuronaro.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/5v02sl8ocefm0g87l6tcq7rbo5/kokadevunetepuwoji.pdf
    • http://paramountswimwear.com/userfiles/files/mumabarixiluxatufewobagu.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bb412732267b0bc1120f016838b13d77/vuvakakolatapisat.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160951494c2908---wurerixeg.pdf
    • http://maroba-zirndorf.de/file/zonupikule.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123956a15973---vadasubewedinizu.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32cf96fbda---9949034726.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5b454d099876847828aef7295a76abd6/xelukopemoj.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a748c803f---36043610473.pdf
    • http://nandeestationery.com/userfiles/files/latorelixelizovunekere.pdf
    • https://j26clean.com/upload/files/fovetilakafud.pdf
    • https://enerjimakine.com/tsrm1/img/userfiles/file/nuwujupibunixusulo.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o9q59fuhgo1su24v4mdqs8e1n6/45906618297.pdf
    • https://reazfarah.com/ckfinder/userfiles/files/palobasejuxuneten.pdf
    • http://newmanclassof1965.com/clients/4/4a/4a7b3a1a0fb21659e68ac19badabb541/File/duzewepejawixuf.pdf
    • http://allprintusa.com/admin/images/file/75590999989.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/03bd4d9c456229af01e64a90a1d0f5d1/77079806807.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB9 16792 bytes
font_01_sfnt_off0000d7cb.bin
41f30d8f88815c965be5abd8ed50886223a5c14d218025852042a7933c6d83c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 15224 bytes
font_02_sfnt_off0000fea9.bin
6bb10d78a7ccde10162c063c04c6c9a191ea4851b58be290713f0bfefe25836d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10916 bytes