Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83ee0d5d5861565…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 04:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39ed37d7a7ba6b53cb6865031f302377 SHA-1: 47c0ce70b0cfb608d900024fd640adcd3b7694fd SHA-256: c83ee0d5d586156519e09421b26f3047bfa9b7608404a0fb34b604a5ff10634e
196 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it is part of a link farm designed to host malicious files. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable security software, a strong indicator of malicious intent to facilitate further compromise. ClamAV detection confirms this assessment, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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=android+honeycomb+smartphone PDF link annotation
    • http://kenshopvn.com/uploads/files/281438737.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090423223873499.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/gedirejefamexusizedes.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/38540555502.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/rosozadinirituwumejetedar.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j1v3qinm50ma165d5u3cp9afa5/jijasusibimos.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/towulobokapelakusexowise.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d6c9bc636524ad9c51bdfa7c598787ef/kuvelorujux.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/sugigasexivanerisinodexiz.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/97038164255.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/64507801776.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/67379460239.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/205c26f7d2687c8ba9866095a3d2a88a/54908631605.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/pojom.pdfIn PDF document text
    • http://tradotel-riviera.com/file/19417480483.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/54551653421.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540fc64917---11840349082.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210908203506.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/73267690258.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edd294f45f---sijifisivinagolupisobuzin.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/98029404509.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/83120877817.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/walupevujodenulowowefovo.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091611445073499.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_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 10968 bytes
SHA-256: 5a2af00a2dbc33cff935ed8cbcf267ff078b357488c436ee5c4106880e18a54c
font_01_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 17228 bytes
SHA-256: 33ee809c26a9076c809e6c7726d6c307152c450e72dbca1cd9ca086ce27dfefb

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