Malicious PDF — malware analysis report

Static analysis result for SHA-256 85c1d4013bd905a0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 05:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e26e0adae9e6fe558f45cc916a19bcf SHA-1: e6dab06a13c5c933f1e84dc1a1719498d8e3639d SHA-256: 85c1d4013bd905a0528c1038ad8f8d8b458fe13493059b1003e42c3dec886402
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://diamond6ranch.com/userfiles/file/xepukebo.pdf In PDF document text
    • http://global-insurance-broker.de/downloads/mixogixip.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/tetuv.pdfIn PDF document text
    • http://biosite.ru/images/news/file/83227194954.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4ff50fee---76734921210.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/80119260833.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/82007333757.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/28487448975.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ccd58fdcaa8a7e582256836d7b5e26f0/24937710657.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/49057547720.pdfIn PDF document text
    • http://garderoba.sk/images/_file/27708442282.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b4369e7f3733009cd1412b73bf949721/nakewifebapej.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/05f6aa32dcf9423745eb96c500a7bf3d/23160037886.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e8b7264a5---69409805579.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/daxavezapubawon.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672901220b---49347151077.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/pozel.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1701071fcdc39b62da6cd35846bdd73/13911482843.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/bebabotedotenavuxogadimej.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/27d755954773f937dd8e7d2951229f13/rekawukigese.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/lejigebinamejinagagi.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/714b203557a1234cd2b4b4cd5c92184e/96233567633.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/56511229202.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/8398305911.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085df68c0ac6---54005744223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dolan+brothers+agePDF 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 18344 bytes
SHA-256: 9ad478dd2d54148ebc0be060733f2caa2102ac43c3adb44bf983e8612a8c0c5e
font_01_sfnt_off000103e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E2 10436 bytes
SHA-256: 333d58fed3528133b02939f6dfb5763c32a8ec1055bf7d2a2085cf2040cad2f8
font_02_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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