Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e30a3655167dc7…

MALICIOUS

PDF

78.7 KB Created: 2021-09-13 02:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6ab92b7408fe46843424a43c68a3443 SHA-1: f58fcf2f0196f46411c541ac100ef655c4c9ec4a SHA-256: 16e30a3655167dc729dfe7ca5b9d7f7e413f7b63ef52d5f9be80baf579f3d3d1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The presence of numerous external URIs, many hosted on compromised or disposable domains, suggests a link farm designed to redirect users to malicious content. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://krisoc.ru/uplcv?utm_term=notification+bar+pro+apk PDF link annotation
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/zomivefujike.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/11865608029.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/kugorubow.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/68262383168.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/zagezijalatadolinixepux.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/76814998295.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/35089749261.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/vizedetaxafib.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/zosomuranimokiji.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210911044538.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/bewini.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/3888977890.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/kitigekejoguluvejaror.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/jufirekopatezulup.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/dulinasapebafa.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/bupirasafudapodez.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/bomizokazu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fv90ea5u6hb92p7k5c6tsmnjof/kukidij.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161391eb361b53---31611396057.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/nobilixufozizuzikumotam.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5981781c---13425767380.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/88521449410.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2j59tbdn72supbm5sm0tfo75m6/64677123613.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/19531738324.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/60551486744.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/2964799490.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/pesimojivupexedakijovetex.pdfIn PDF document text
    • 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_off0000cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 10336 bytes
SHA-256: 34c1ea3e96a67d02e88d9b3d541aa8dd09cfff5f0c04ad31e6974e7ef69d1326
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 17740 bytes
SHA-256: 43f036213991f98a17557c611712ebf3ab96832365970e041f9dce1c4c995a46

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