Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2481fd1951f04e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 11:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f454da0f9565d70017ee5b39f6dcd34 SHA-1: e99ecf625eee50fe674fea02fde9547a3f21ab0a SHA-256: db2481fd1951f04e12f1af3c886abbc8558173029bb77ec2a2cd978da1a5a299
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to potentially compromised WordPress sites and disposable hosting suggests a link farm designed to obscure the ultimate destination, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2239f33ed---sujanamedoduniwa.pdf In PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/41ba736bb0bed766cdcd4bb85856795f/14035980671.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/vavememavegisesomutakogil.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/51359b6c4197e91f55916425b515e0ca/18897535133.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/na446jt83a7a9nn1ftk95sp1cs/51452633075.pdfIn PDF document text
    • https://ebooksweb.net/files/file/fesifuwotuloxulukox.pdfIn PDF document text
    • https://rjpexport.com/files/42633898767.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/86437477047.pdfIn PDF document text
    • http://tempatpasang.com/contents/files/badigoxoxotidewufosesefe.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/gebokavonojezubi.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/13751560049.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/kedetok.pdfIn PDF document text
    • http://risme.vn/files/tawirejuz.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/84767699723.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114570ed986d---26507874294.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/25882732031.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721470d31a6---newosinad.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/e0f41ef86e9fd1b610b82a4eb9f5c775/lufunirozawilemonufuwumi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pefutaparifewuwugadurika.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/molobenetagilakof.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081473e8bced---7795851375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ohm%27s+law+lab+pdfPDF 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_off0000d7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 17064 bytes
SHA-256: 1e94eeb70655feff07cf65bf7e28aa35a5522a0e62d11f073b549f5dd126489f
font_02_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 10404 bytes
SHA-256: 2eba0406aeee6291b240b365e96b9dcbcc7775fbae1dc36ecd8f6db49c9bd0f7

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