Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63d376e4ec603a7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 08:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d8b7df47df48cc0f4ad230b9268342f SHA-1: 43e29a1815dcd3d8b833efe7f9773660c1b54340 SHA-256: c63d376e4ec603a7d39793177dc5f1a476696f0ccd5e67577e644de60c62e128
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious and exhibits characteristics of a phishing or social engineering attack. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into providing sensitive recovery secrets or private keys. Numerous external URLs are present, many hosted on compromised WordPress sites or disposable domains, suggesting a distribution network for the phishing content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://allytemp.ru/uplcv?utm_term=download+pictures+from+android+phone+to+mac PDF link annotation
    • http://surmounttravel.com/userfiles/files/noxawerudedavorimika.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/86018373677.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/60579132838.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86c903450---58187544490.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/96130935922.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/toxekufuxeridij.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136476d564fe---jubetavedekun.pdfIn PDF document text
    • https://empresa-venta.hr/files/rujewofapurolasuxebavuf.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/fotizibil.pdfIn PDF document text
    • http://sinoorchids.com/image/file/36056623479.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/gowororor.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091122111174195.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/38260881392.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0f06e504---43776884292.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/jugivudixerizavuxanifujob.pdfIn PDF document text
    • http://ranch.pl/files/file/satabifiduboja.pdfIn PDF document text
    • https://ebooksweb.net/files/file/71967179171.pdfIn PDF document text
    • http://packturf.fr/files/67680678675.pdfIn PDF document text
    • http://quangcaovuanh.com/vietkiendo/upload/file/tozibudalimisak.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/bezuku.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/libasegoluvemok.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/dojedemababefalozos.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/93123591187.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_off0000d4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 11072 bytes
SHA-256: f85216c3caf44c02deb1bec32211dfdec9b652fa035637e25d078784ce38d4c3
font_02_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 16900 bytes
SHA-256: 47fae6d518f13d9252e8d5e5819c6e61d9c67dfbd0ddcaa3e5c52e7589a80bbc

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