Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6e7855555aab8c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 21:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5f370144551a089e154de7604c5f481 SHA-1: 1b2e995c87c9c630e653376251a6e31b5c4d154c SHA-256: 9f6e7855555aab8c7a54f31e92835804d373f0f545089b977001749d58aed397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of external links indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=butterfly+pattern+printable+pdf
    • https://nhahangbienhaitien.com/uploads/files/86238866762.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/481d7fe6c1287bc6f443795f35cc121e/zidemowofibibikiba.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086b23720c68---3309342820.pdf
    • http://accessprecision.com/userfiles/file/jetetidawuzasanojowewo.pdf
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/pefudawuturot.pdf
    • https://idroilektriki.gr/files/file/95852408038.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b14c87998a5be52904ab3dde710a6164/kugujeposapaseredenofaku.pdf
    • http://oipipleszno.pl/userfiles/file/76992366071.pdf
    • http://jongauger.com/ckfinder/userfiles/files/forowobamolomewijexi.pdf
    • https://aljazeerahdrilling.com/userfiles/files/jajadavibepeteda.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/46a40ccf039cd672ffbfaadf6800860a/nosobeku.pdf
    • https://hanomanberjaya.com/contents//files/95561637607.pdf
    • http://mylodge-naoshima.com/6858312829.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d183cb411c---nukoresisoxukebonudezoda.pdf
    • http://deltools.com/userfiles/file/bolasi.pdf
    • https://nanyangtextile.com/userfiles/file/12221313089.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/sekaemcli1ducq37ulp5ragg4d/xatanunipameladetusag.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bec725a6604---doloxizo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1a97bfc5be4fa63338eab32373c64e9b/lavamipipaduzenobemabi.pdf
    • https://cardion.dk/gfx/fckimages/file/nuxerapilufij.pdf
    • http://ryukatsu.com/userData/board/file/xusofafuxuwil.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b278364e3---fetafuxisasejetosod.pdf
    • http://hanyuchina.com/upload/files/66270779680.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A0 16792 bytes
font_01_sfnt_off0000fdb2.bin
fd3fe01e5f33d70cefe8c033e5d198c46c99ac63a8f4bb2ef07cd474e79e92ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 19068 bytes
font_02_sfnt_off00012f98.bin
1801d5ebf8ae2139aa4300b5055521c92a4d9b3ab647c0ac744ce12a28cf174c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F98 10612 bytes