Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdfc7385e0e0bbbc…

MALICIOUS

PDF

86.5 KB Created: 2021-09-17 13:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 79e2f3f3343a94efeecf7c72946d9426 SHA-1: 84814a727ca9bf263dc1baac059ef910993c45ce SHA-256: fdfc7385e0e0bbbcdca620c77927dfb9cb42e48e09269a608c68f1b45899b400
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it's part of a link farm pointing to compromised WordPress sites, suggesting it's used to host and distribute malware. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nozawifepiwigo.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb5550b68---15614136894.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/55468112243.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/68993957526.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/lifoxeta.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/fusovonifedif.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4ce6d9d3---75239307800.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ed5f881a5bd22287533a43942263d1c5/63214215837.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/59222267390.pdfIn PDF document text
    • http://gro-felix.si/uploads/51237436647.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/9539501698.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gabivotukivigek.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/97897742673.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/9352127625.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8fe870cb---benuwurajejuzej.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210917120724.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/88765647161.pdfIn PDF document text
    • http://regcureguide.com/files/files/78076220796.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/navofenijotowopezuvipup.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132af38c249c---7661866908.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/86155715048.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zelagegujej.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109171802131065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=telecharger+gta+vice+city+pour+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_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 10868 bytes
SHA-256: a5cc195db145a7d6d6eb1bdcaa414eddcaa563d3032249153f1ccc182587acef
font_01_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 18840 bytes
SHA-256: 62b74b95236aa4960bc8222b3794f148d095cf3e4480200429fa3cd07e17e0ed

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