Malicious PDF — malware analysis report

Static analysis result for SHA-256 26930c80903251e5…

MALICIOUS

PDF

134.0 KB Created: 2021-07-30 09:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eade1a36875cbab25a9ff057c74efff4 SHA-1: dbe980290e434e7afd425f8125e29f4e3351cac4 SHA-256: 26930c80903251e50f6b14175041f32f8111d4192253ef87d43de8509114a841
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting domains, a common tactic for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hostsolutions.ro/app/webroot/files/userfiles/files/kulaleboju.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/513428c4754468e2e109396b52f7cfc5/belisomiwezawabojopulaz.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f6e4e149e---ribegi.pdf
    • https://unserbiokorb.ch/userfiles/file/vumajimukagas.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/rt5earoguk1snsauj13hrvqi6u/51135333464.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f240899e4---74771071070.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c1306d95---gadinifudubegogoxenopa.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/75414989872.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/7le1b72q0hjc8rds949rh30n5f/puwudabonexelepugemi.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608246a2711e4---gabumujixokabewu.pdf
    • https://hocngoaingu123.com/upload/files/mezosuwoxilitifekoziju.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/bessvilu3vichiereqnamlucc0/lapesipudetepe.pdf
    • https://canionglobal.com/FCKeditor/file/45666066274.pdf
    • http://qazaqbanki.kz/data/content/files/votopevoxi.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c01c3a26030---tunofupekanones.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0b06fffb1ca0873be5e3c6ad83bc24b4/jutunonogimonodew.pdf
    • https://gymlesgeants.com/upload/editor/file/63017725543.pdf
    • http://technoculture.cz/admin/upload/file/wuxawagafagub.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dh7tv2h8352a9d84u06okskcco/gulagid.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b607f5c3e6967272a164a49d63587a14/93959828584.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb98b071096---basumotajotetalovo.pdf
    • http://robwalker.net/fckupload/file/60999780758.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e977cc428fe---pisewasekugujapixika.pdf
    • https://mimpishio1bet.net/contents//files/87307258938.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/7dcfcd5727b27e44320b57466648ed8c/ketemuvufev.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/4e0671d04f595b32ed58bd1615ef9fef/latijiru.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/nbfidoc43l29bamskuug2crt31/33357728202.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/845a2f6330e8581ccf355c203f4001d1/50425690561.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=is+viber+free+without+wifi
    • 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_off0001ab8c.bin
2d7aa2ef023dedaf7e4ad5697b2e902affa47a4a907594f5ee6a213247b32b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB8C 17608 bytes
font_01_sfnt_off0001d8f0.bin
a78ee499a9ed360b9e9bd30539548b5db6b5e20607fd7e5336c1eefcc8bdc4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8F0 10340 bytes
font_02_sfnt_off0001f088.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F088 16792 bytes

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