Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b84da57980bf2f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 19:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06d989e2ac921fc782143b1ac95c68cf SHA-1: 81fb30143a8628cf2b6ac2bef3f0e4e86cfff741 SHA-256: 43b84da57980bf2fa77dc416f4ea27daf992bd60333f41ee0efe4648fc75270a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=hemangioma+hepatico+pdf PDF link annotation
    • http://haki.vn/uploads/files/jijetupe.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/75526822125.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/judoburezudafimole.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/14872609175.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d280d74676207ec56d29dfe4a26bf3ed/45219901545.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123df3a9350a---14157236429.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/69646713162.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/72047981957.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/7224126465.pdfIn PDF document text
    • http://m3csrl.com/file/xavefal.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/25325070955.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/72078308706.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/sakugewadexar.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/wunek.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/tepivibofax.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac67bd2b5---silomazemajobot.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/de5d38335648b20936eb5a567f4f68e3/34950016439.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bafcdbdaf64---sejejivukogisajesak.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/52484922391.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/toxafafizobam.pdfIn PDF document text
    • http://yoron.net/up/files/33294494812.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/refagu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/36121988390.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_off0000cc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 10744 bytes
SHA-256: d1d0dd562ab497a5957060ba7f3de12fa8ccf5275040c4308456c3a8b3aae459
font_02_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 17548 bytes
SHA-256: 7e8c3cd316f7aeafb24501a5c71bbbabe784098dc80a31e5230ba945d0626c0d

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