Malicious PDF — malware analysis report

Static analysis result for SHA-256 607fd25bef935dc7…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 02:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5baad151b9c68f5b5387984fff9cc22c SHA-1: 87680252d77546358aa59fe07f1e559e7ca8c33a SHA-256: 607fd25bef935dc7d20e879c88ce4affd1370a7a7ef7247ec65a5c4f476643e3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vocembalo.ch/userfiles/file/pixowowavixumesagade.pdf In PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/donedatuzavakudozaraneve.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04ba38008---purejilukawonoforusovu.pdfIn PDF document text
    • http://uhorder.com/upload/files/situzowokobuxiwaxevazetu.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210712221359_18310287.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/nuramixanovabedewekawa.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/xanez.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/sojumabufe.pdfIn PDF document text
    • https://akvaguru.hu/user/file/9047708192.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/femux.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/44953362053.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/24725600848.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d08e554d63cedabe5d1f342327cd2496/nepepewoguzawoneloxas.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sqj9kdadlgnmn7b0fcs2ckm5i7/pixetakifafugakukamobatom.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xunifejuwanasap.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719701217a8---terofiji.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a1801e019---57589909016.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/7017735560.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/duviresofusuvigapogitus.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161218c031f84a---laxivijivitusazoga.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f7a3375c9---44638865273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=jeffrey+archer+prodigal+daughter+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_off0000ca30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA30 10832 bytes
SHA-256: c96ecfde61ae061aa9a10a3f50916a9f1856ddcb92628a92ffe4e3702396addc
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 16800 bytes
SHA-256: 66cd7aae400f942941347f1e65c9ddc1e6632ebc587a6587c04ab47b818ff892

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