Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a9a565a172ef93…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 14:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0c1b1d5b6897c993c4d19ce85aa4368b SHA-1: 287d5a8f6a78f16344447c51caa9bd057fced266 SHA-256: 73a9a565a172ef93ec5e19fa54aa4477443829fa3ea2eb161fbea83c8f54ae16
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides instructions to open a password-protected archive, a common tactic to bypass gateway security. Numerous URLs were extracted, many pointing to compromised CMS upload directories or link farms, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=5g+iptv+online+apk PDF link annotation
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/zosixemovikonosonuwu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///segatasoxufofevuw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59a69ea56---68562110748.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/236edeb5a242bde086286659fdcf877f/nunaxop.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/wisolavozozadigakuvotas.pdfIn PDF document text
    • https://hoavily.com/uploads/files/mulakapej.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7f87f1c0ee07fd89e0489aa7e64c096f/kexafixigakojit.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/tuzujejebazomavut.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/zaburapesubinunelanabe.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613496c5b7bc4---dovanurukoxekex.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614178cac6500---zukigunorumolizafum.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/kowepukaza.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/vapajiwiwupapogetanuvonex.pdfIn PDF document text
    • http://dejede.com/userfiles/file/tubuwotavusilugina.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/28614379705.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/9723780008.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6fd70b19a---1137941550.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/pelibekulafoge.pdfIn PDF document text
    • http://js-space.de/userfiles/file/wuximobel.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161317299ddeb0---43096563436.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/88621377974.pdfIn PDF document text
    • http://skrn.cz/pic/file/pimupalomiwiku.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/54451331418.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373e6f7e339---10753303499.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/93479829363.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 18136 bytes
SHA-256: 7d020fbffb0d52c894204cbeb9dbb5fef7dd9c953a2df8d1692278e3396ede54
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 10356 bytes
SHA-256: 5fb42e9985667efc50bd8b60a3f34209b6ca20fc35c295c61fff76702c94fe6c

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