Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4fc9b07ffe7a35…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 10:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4fcf8f4d7d3315af94c800c768d26ef5 SHA-1: 2fd0074fd4aa6e2ce3d1626b1699a2236590ef1b SHA-256: 2c4fc9b07ffe7a35d91a580c99cb56051477c6287b79c7dee24d15c077b602d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=wifi+mod+apk PDF link annotation
    • http://fulns.com/uploadfile/fckedit/file/1631557683hAgu.pdfIn PDF document text
    • http://idcla.net/upload/files/85413456105.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/30519503421.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/91867805026.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/vesovavogij.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/velapira.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/1425418249.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/10757606813.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ece46c6b2---12469264453.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/92771221954.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/vewujufaguroliwobalurun.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/83461201433.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/lizat.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141893f0443b---93041773474.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b579628bd2---75607417096.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/sejasuxopajiwazozunozu.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091021145680554.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/39665966048.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/faxinelejud.pdfIn PDF document text
    • http://www.bash.cl/media/file/gerevaxopafifeseg.pdfIn PDF document text
    • https://maymac.info/userfiles/file/63140594240.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/81625350013.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/pezuxoketosusezozavogu.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/14468204326.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_off0000d7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10096 bytes
SHA-256: 6ffe731ea57afe59788cff9d54439e6b791d151b0981504a0344b28750995b5b
font_02_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 19352 bytes
SHA-256: dcad677fe7bd57a74ff5ef98119d67ccf3b38c1efd5315ab9448bf7362c53815

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