Malicious PDF — malware analysis report

Static analysis result for SHA-256 86949878e667e9fb…

MALICIOUS

PDF

111.2 KB Created: 2021-07-30 22:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3b67c213d452f6cc954d3fa4723caeb SHA-1: 91af4e9f5c5dbb906ea886f7e8a4688256242cff SHA-256: 86949878e667e9fb6ef0899413b79131447d376c4c14c7a2e1bacac61fab90bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing pages. The embedded JavaScript likely facilitates the redirection or execution of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://bestcoloringpages.com/userfiles/file/munaxowumunufexe.pdf In PDF document text
    • https://alyosserspneed.com/userfiles/files/21173552757.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/karikilekiwinufomupobera.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rowirijokimew.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/40321092487.pdfIn PDF document text
    • https://argumentua.com/i/file/savonu.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/28819882224.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87d0fbdf8c---61066055292.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/ligotok.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2ebf8162f---27936500467.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/40761000039.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b284c8c7---wixamexawanomitaperil.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090cef2df4d8---30465703560.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/pedojas.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/87019410590.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/70862803373.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/norumeterumomeviwefuzuku.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/mufegivojorawaneponazu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/5266309042.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/6081093114.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c489d88752a8c9a66184181baaf23540/sojefefusajaruratafozore.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c93452e559---7442142895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=geotechnical+engineering+principles+and+practices+coduto+freePDF 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_off00014ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EAD 17464 bytes
SHA-256: e4aa192745137ce3032e927f57cb119fce5af7fd862013ac43d5f31a6a7a7570
font_01_sfnt_off00017cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB2 11036 bytes
SHA-256: 0eaf5a4d155b81f8a2a6cf20e084514c8ceb8482de3d7a0b5f5d4ee868ec8f82
font_02_sfnt_off00019625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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