Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7a24bfab03c53a…

MALICIOUS

PDF

84.3 KB Created: 2021-07-17 10:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04f54a6ca2752d432d20c0e74e0f9e88 SHA-1: 219f650d6f1905a2595bd30b47b94e24b3aa843e SHA-256: 2d7a24bfab03c53a997b64f0f7a9dc849fb8399506c09797780b8851968f9ac0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely serve as a distribution mechanism for further malicious content, such as phishing pages or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f64ea5132---lapojebi.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5a3f1e89---44706536188.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/15930132407.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/54968867062.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/xogaziz.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2da30f3f4---63629232446.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3abada75c1---lamezodejomen.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/de46d090c973ccb57083317155411361/31835172973.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e3474d98ea9bda7db955e9f27cc46e17/gulalasawuwuk.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/doginuzid.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/86996487019.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/50445462134.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/degasasesog.pdfIn PDF document text
    • https://carlojans.com/cms/file/15701953003.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/3932607789.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19f22def0---28793756027.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/44807914325.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/sojepevebejenolale.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/relat.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/fakizolubed.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/81cdbf5dc7d3c371640c21624d2e9269/39651642626.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3a4c484fb1ecc2e924adf35040efb93a/61479566119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hardware+and+networking+mcq+with+answers+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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB59 17176 bytes
SHA-256: 4a06d0e354bde906b1223f932b2a7a178e45074bfbab8efc82a5e7c0d75c2149
font_02_sfnt_off00012856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12856 11336 bytes
SHA-256: 05630a87446857c3ce76fedca546ee7ec222fc4aa7fdf38317ddcef8a9932a15

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