Malicious PDF — malware analysis report

Static analysis result for SHA-256 58df122674b6abcc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 05:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edb54761b4ece0c5395fb877be98778c SHA-1: ca60ad43b9be8b841405e0ae262617d30271d1fc SHA-256: 58df122674b6abcce6d3f8d1ef593083b9f7247180bb80f01ab8933e33aa2b11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of embedded JavaScript indicates an intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/0bb4b015db75fb4eded736f4e607c5a0/nimawewasixus.pdf In PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/79732921122.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905174817.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/59358706713.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/newakiwagulisojigikatuviv.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/66650318655.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/wuguxezinenexutaxawena.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/93ddc9c38273b324dddce03e37fd0fa9/zulekefak.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/3127776595.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96887dc55---fuxobej.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/vevipizofaxufogukofad.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/ferenaveze.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/pemuwabeputi.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/56353728645.pdfIn PDF document text
    • http://vititanon.com/user_img/files/58168955219.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/toxesigumojur.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/duwikasun.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/76736075334.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caf35777ce---72664188990.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161374821bbe3d---49045340527.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dirigigitofomasuwa.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/82552485751.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/86185743856.pdfIn PDF document text
    • http://rhondachem.com/d/files/51703994331.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138138e4ead7---kabinerofagajufotikapiv.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/9527377857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=no+aparece+menu+recovery+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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 10620 bytes
SHA-256: f857fb982d52865da03b2732d205666df1692f7598132193a648d0750637664d
font_01_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 17788 bytes
SHA-256: 97aa8e5c3e5fe24e74d1d4aca6bbe83cb1d830b564dd122a4b45b6214f19d736
font_02_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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