Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d28dda9b0c9bc02…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 08:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34b41eb05416f6faaeb9f38c9e16db38 SHA-1: 312d706c36b699d4cf2049fbc7ca2da55ff7aebf SHA-256: 1d28dda9b0c9bc02fd2bfae707b6cf3ec1da307e5f1c73f1269478e84b4dce3b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many links pointing to compromised WordPress uploads and disposable hosting. The document likely serves as a lure to direct users to these potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://agama-rc.com/upload/files/13947191049.pdf In PDF document text
    • http://mail-business.ru/uploads/file/988571861.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/30252433572.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/fenedanad.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0943f118f---55604634633.pdfIn PDF document text
    • http://szhlfz.net/upload/dorisagitowafopezeme.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/rorewitapomaxu.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/6371531093.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613985f9265c1---sukujadalewokopagotimupib.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135f33442339---21268383472.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/silawiduniko.pdfIn PDF document text
    • http://smogy.ru/files/files/xamosizadoseril.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/86058934623.pdfIn PDF document text
    • http://standdominica.org/files/files/38038180535.pdfIn PDF document text
    • http://aimic.com/userfiles/file/damiwunepulureserarura.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/pejogopek.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/2927642226.pdfIn PDF document text
    • http://uteambio.com/upload/files/xonitononazaxulo.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/7783682085.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/xorolofunonaxal.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/xedatozapojuremepivitefe.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/092313519568.pdfIn PDF document text
    • http://ipublicity.cz/data/file/99403152087.pdfIn PDF document text
    • https://swiz.eu/files/editor/bitisemikodapukifoguro.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rnjkvkdml52bl9ki1l7lqk5ug1/22549820892.pdfIn PDF document text
    • http://taxfreepoint.com/file/87900255488.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/95285920833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+draw+on+a+photo+androidPDF 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_off0000b5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 10220 bytes
SHA-256: 4b46868b84851179b0e7c6503ce4af10b903e550d198a65d4a737acc1b3e2d63
font_02_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 15724 bytes
SHA-256: aca7c8d00af07e2d1545f924a4dfdc9a2bff0b69dd8cff5518d8f2793f90794d

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