Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74d9e3258deab75…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 04:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ce11c48b07140262d5f814ca4798a71 SHA-1: 8c979fca1a9caf2a65bd74cdf3cd811607ee8fb9 SHA-256: d74d9e3258deab754b0a984dc856bab98be0d989de50b1a4c0277a6bb0e8fbf9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress uploads and disposable hosting. This suggests the document is designed to lure users into clicking links that may lead to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://barcelonacentremedic.cat/files/galeria/files/91518418590.pdf In PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/7931611167.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10595522047.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/todilugowipotewe.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/73758280440.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/83260215256.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/43030911216.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/pulugo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/pkvva0v46bmlarnt0ebhsd9jih/jowutelipalog.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/zeketulujumuvobipan.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/vipex.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/7405941743.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142406a65501---zuleseduzetuvovimo.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/jivojeloxe.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/45309402091.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/wubelugafaropuf.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091220170143.pdfIn PDF document text
    • http://artepcb.com/upload/files/90142226853.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wiveguwud.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/vezejol.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/lajidawuwoninar.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134065b05f7e---zefasararav.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/74603119636.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/84449316698.pdfIn PDF document text
    • https://termoformat.md/img/files/34764703767.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/74289482545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+the+lives+of+others+full+movie+english+subtitlesPDF 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_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 11084 bytes
SHA-256: 0ffd67676b55f89aee7aa46a7e64c8bd41225e3950582830d0aa7e32f7d00c96
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 17404 bytes
SHA-256: b4475f8500335eadc44196ddbd03ecffa8cc4c312a195540626e0a655b3aae71
font_02_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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