Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dde14164a33994…

MALICIOUS

PDF

74.3 KB Created: 2021-06-17 23:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7eb4869316d6935b3c1b7f1794e5a22f SHA-1: 8a4062c9763c28283357e1a8b9c13a2ea2d1d8a7 SHA-256: e0dde14164a33994116e32ecc4f88bf887b92ef4742f8e8bc1f263bc3d84c1e4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing lure, presenting a link farm that masquerades as a free download for song lyrics. The presence of numerous external URIs, many hosted on compromised or disposable domains, suggests an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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=best+of+westlife+songs+free+download PDF link annotation
    • https://hkbca.org/UploadFiles/file/20210526115732127.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/85553912472.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/nadalin.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608747a10fb3d---rexasizanafudap.pdfIn PDF document text
    • http://dnepropress.net/files/file/3511637579.pdfIn PDF document text
    • https://dm288.com/slicice/file/dusokumikuzaxozudube.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1lo6f734gs86q48fcqvjaaaln2/2241815219.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/90033941875.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xosepepo.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/78184778935.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/bagezuj.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088ac963fd19---77759730204.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908630c8875---19126667783.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/96503476037.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a516096---3235451612.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898be0ce8e7---26835536745.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb40bcaf0b4---lurumosijubetem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 5004 bytes
SHA-256: cbd978ebf5995d039333113d4fe26479376f641a6d5c87af77b115d4ebdb647e
font_01_sfnt_off0000e9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 10672 bytes
SHA-256: d0613681b8d85fe9867d6661148ff39bbb5bf70d333eb16ea32684f5ff81d25e
font_02_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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