Malicious PDF — malware analysis report

Static analysis result for SHA-256 9553d34f67e43b32…

MALICIOUS

PDF

96.4 KB Created: 2021-07-25 05:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af9943d9a1c965caee62d0a1279e19a6 SHA-1: cd73531df318788ee8cc8b033df6b20fe360b6d6 SHA-256: 9553d34f67e43b320fd872ae552458e806ab754799fbc257b56c504044341cd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963f7254078---86847952219.pdf In PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210626_7A489B585E997E0F.pdfIn PDF document text
    • http://halaljones.com/uploads/files/23276503418.pdfIn PDF document text
    • https://morabia.fi/images/file/vunulutokadav.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/ratamuselidogatukewalowo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1051b0b40---bekokakojaboxegabexo.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bisedolirenuvowixi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160890c27d4cfb---73926675049.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094b940728e4---berusalozivode.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/51a2a9371713816d62dcca38eb1b0a68/repaxuso.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hkovg0gkvpejs7i8vifpe9l2b0/fifutijiliwodekowipuj.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6ddee33c598cf201a1dca39a03129608/xewifunowugabapajezusadu.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/sapimitetorebujujosan.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc1d80378d---7731309491.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/32960093328.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c71adce1f1cd5516f14f7563b4eef645/14472768306.pdfIn PDF document text
    • http://novichiha.ru/pic/file/88933735788.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/197331ed27e1729b4bdf74cda03cc086/34731847947.pdfIn PDF document text
    • https://buka.ru/sadm_files/37971183440.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799d96a431a---nosaxem.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14450d789---58121756050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dibujos+a+lapiz+faciles+chidosPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11507 17380 bytes
SHA-256: 8683f94a20cb1ee1d1ec16d926b160ddc8deb91abcb8d2bd26a54804c773cf5c
font_01_sfnt_off00014068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14068 10848 bytes
SHA-256: 60a5f3698dbbdf5a9d21a2e439e15955c938376e616849cc1ba1e96aa91eebc7
font_02_sfnt_off00015954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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