Malicious PDF — malware analysis report

Static analysis result for SHA-256 7510c0c1b642406b…

MALICIOUS

PDF

99.5 KB Created: 2021-07-15 12:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c830ceb8c7ae4b85a6c04f82fae6a5f5 SHA-1: ebfa4deb634561008d3d2c69112591ffe4695222 SHA-256: 7510c0c1b642406b5e545b7dcb34c8db10678f6657dd9c56a26806e85090af5d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable domains, suggesting it is designed to redirect users to malicious content or facilitate further downloads. The presence of a visual download button further supports a phishing or malware distribution lure. ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=asexual+reproduction+worksheet+pdf PDF link annotation
    • http://jrmhandling.nl/upload/file/gemebelizi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160906c2c84f04---lajonojokuxadewojovevufa.pdfIn PDF document text
    • http://nessium.net/userfiles/file/fijuxogadowutamiririzan.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd26c24bbf---namixodejegoki.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/bazebitebavud.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6789de018---motoloxogigutefitikizi.pdfIn PDF document text
    • http://kaies.cn/upfiles/2105270628284274742zjtbv.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/00604c02818b48ef208851619217ba19/55393175937.pdfIn PDF document text
    • http://www.emailposte.com/pictures/13940423444.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b911c77738e---lotovoguruze.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6c861946cf10b80f2a552c7926430e87/50020416189.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/13046354178.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/49325105518.pdfIn PDF document text
    • http://timapools.com/uploads/files/jatitenef.pdfIn PDF document text
    • http://kfbi.ru/content/file/putejewojurabilurad.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/u90qsohiqmv8ov07tks4qmb8k3/fifanuzifa.pdfIn PDF document text
    • http://qzgj.cn/upload/file/latikojuwasisureranududo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/48759725193.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/021225424556.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/zaxitudiwuvofedok.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/78910961304.pdfIn PDF document text
    • 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_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 11076 bytes
SHA-256: 19c777bd74ec728715d85d698ecb74d3a613c26e8925a15c60f23e8e2d1c4a16
font_01_sfnt_off0001391e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391E 18156 bytes
SHA-256: a3b11d60d3b770ed07d96d6ecffce9600731a7d526b3cd415d756e5382a1afa5
font_02_sfnt_off000168a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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