Malicious PDF — malware analysis report

Static analysis result for SHA-256 463a44f05e06ece5…

MALICIOUS

PDF

117.6 KB Created: 2021-07-28 01:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4ee16bb4ee1f98eddea1b95e9539275 SHA-1: ef49302942672164102e514cc8da57f3923e6d8e SHA-256: 463a44f05e06ece51f446003ac8126a721a5370300703e35f05cbbd8948a6a7a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/dc42fdeffbecf77533908036c45c18fd/ketowixumaberetuxivurale.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160795a1730814---wawinu.pdf
    • http://ogbchurch.com/clients/880797/File/10405831264.pdf
    • http://misterholidaysanprisco.it/userfiles/files/34885594219.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6a1339a06dedb7b4f79a69b87b7aaafb/kesavitibuwodeburupuxasur.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb11da2362---darubipoxudexex.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2s3o3ec4hf3hkl7et30ct8ra0t/17205801858.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/tefumusixaweferafira.pdf
    • http://maihome.hu/admin1/file/bebofererofofaluge.pdf
    • http://onsijsselstein.nl/userfiles/files/99065681788.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/3885752793.pdf
    • https://dm288.rs/slicice/file/36577018896.pdf
    • https://teddybestore.it/file/87513238359.pdf
    • https://verner.lt/images/files/zibubed.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a81f40545---pezikokusa.pdf
    • http://namhungholdings.com/uploads/ckfinder/files/sutepizujuwuzu.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/nakipubepuxa.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c6366c047---tetebabe.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/4rtvkeqdtp1d8h3ajqc4onrl58/79157293670.pdf
    • https://maconlux.lu/userfiles/files/72729651946.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ec3eeqn2huo4h66mhdmc8ho7n3/7349639125.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a039b0b106---xujabum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shaolin+soccer+subtitles+english+free+download
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0001922f.bin
7eab74c7582279bceb446cba8ab1f5a5b31af3655c10213ef5eb41d22d950797		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1922F 28836 bytes
font_00_sfnt_off0001096a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 16792 bytes
font_01_sfnt_off00012181.bin
57e3f4024885a4ff4f9910433725be71d618653cf95a540919cebcbb2cff4b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 11156 bytes
font_02_sfnt_off00013b5c.bin
8a85e56f833fbcd742142adffde03e6f35bff2f120b73a0d6e6fb820d63f2770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 30660 bytes
font_03_sfnt_off00018626.bin
4b87d6432957a29260bd8fa99d33088e1fecfba05270c36ad2afe2c581a12b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18626 2940 bytes

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