Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d3dde861d6596a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-21 19:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16464b1b8a30ed83f2db9289cea1050c SHA-1: e8c3ff4c5766508d1ac2702846da53422c8bc0f8 SHA-256: a2d3dde861d6596ab4afe00615346867973e40b16994b5222bc765ba78d6dcbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including a link farm hosted on potentially compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect the user to a phishing or malware download site. The presence of embedded JavaScript (T1059.007) and the nature of the links suggest an attempt to lure the user into clicking through, consistent with a phishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--2e0b95unoa536adofm5h.com/userfiles/file/topuvirogo.pdf In PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/cd51725c778c6313e4c35b3d06c87a19/39213388689.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/15021350196.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zemumotejomaw.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/57998048044.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/sipabaxole.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/31924688143.pdfIn PDF document text
    • https://vientangluc.com/upload/files/rugomubumep.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/81321739509.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/rokevikexifix.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/sunag.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/padasakaxejed.pdfIn PDF document text
    • http://ciskmv.com/css/file/45103125276.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393c4a93501---tajavijiwebugirikifuxo.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/82932714022.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/hblibthaskjnqsk66c7e489mlg/pabudiboxaw.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c7c8f2e937b48e791f13e1626e51f38d/76844344070.pdfIn PDF document text
    • http://gaudi.tw/upload/file/78584484040.pdfIn PDF document text
    • http://yuhuimachinery.com/d/files/14240769563.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/kemivezis.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/tulejigujizasurajutonizuv.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/17866614555.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/bupupuf.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/wujazoritezawabosu.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/kuwunoligogo.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/6300193112.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/mewisodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nyt+app+dark+mode+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_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 10520 bytes
SHA-256: 8ab6d3c3b67bf1e25b1d4e21c2ca84cad933d575b1623c16d85a1f1665f5d42a
font_01_sfnt_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 17404 bytes
SHA-256: 2e7044110da1f2db38f2d0176f77d9786f16322ff8a1dead6e9327b5d83bfc6e
font_02_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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