Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f312d0e9f8fdfa…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 21:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d7fb0f75feb19895817e123bbbe1b4f SHA-1: d5edd7d2c9a237b2fb82794ccc1cdbb32b20ea7a SHA-256: 70f312d0e9f8fdfa792644a319c82a9a02f4ef1bab08de831275b14534c13953
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content or redirecting users to phishing sites. The presence of numerous external links, many pointing to compromised or disposable hosting, further supports this. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/86182807237.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5qu10j4mcfnanb5p6mb6fdro9p/53099611429.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/defesofafivavavepujixe.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/xabafevefuzekefisirorow.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ff5247a4a8a05c4a212bc8117b3be98a/68660290203.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/90426413975.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/3421352004.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/02/48246285055.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/72570302034.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/zanudipawagokenigasava.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/3728753067.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/64342481475.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/xevidinokuvujasaravezagu.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/bujepetipikugoso.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d482886a66---51887640688.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/dajogorixirosejezipu.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/vutarefijiguxesa.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/kikizowakebobubuludiril.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/88258692698.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/99886319700.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161372c1f4adff---gonuwar.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/78232463848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=maleficent+film+complet+streaming+vfPDF 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_off0000b9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CC 10884 bytes
SHA-256: aae78c17b6013f547675fe6f82271463e8201d20fa59997d9fcff5324f8e4a4c
font_01_sfnt_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 18764 bytes
SHA-256: 51fa05220bca607e9da3b32812b934639a685bfb4ecbe32dd8037a8d0fbc433e
font_02_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1