Malicious PDF — malware analysis report

Static analysis result for SHA-256 9896c800e386ec0b…

MALICIOUS

PDF

83.5 KB Created: 2021-08-23 14:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c68e6cd48c639a73d5c31a4f74557be SHA-1: 5243ca465dd7f77f21a9ce8ef3080fbcb48d6c8b SHA-256: 9896c800e386ec0b91245f11ad1a82c07078153fea5568b76812645b9c072db6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting further supports this, as it's a common tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5eadsav8hmpvp6b3c6u8gr4341/53301529743.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607612d509ce8---dujovuvulofoborewoxixije.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089e07e35a4a---dalolenisagoxogo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160708f1b33884---6556118541.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f7d9527b8---21794952727.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ir0jg6btp025jhuv4kb8ghole3/65072409249.pdfIn PDF document text
    • https://tomas-music.com/contents//files/zasufeb.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zewesalelujar.pdfIn PDF document text
    • https://orangerun.re/photo/files/piguzemenaxewudufa.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210522053339106.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d21a5ae21b8---42396113476.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vipazowamasitagixu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611805bc24574---34252644205.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/k62tvhn6e662arkdnee5j3chhd/kolanelawakipikeveluxo.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/38435929941.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d2d18cc4ba41a984be34d7766ce5dd7c/mimekabewiredoni.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/61241452035.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/14061710777.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/57182106085.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3afc3e9af793fb839bc70e7f4cb67c18/11451600175.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1624719592zasigijoli.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/medaxukokebodijomizu.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/86662178640.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b80ac57f41---borirubekusekasoxibozug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+calculate+the+yield+to+maturity+of+a+bondPDF link annotation
    • 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_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 17356 bytes
SHA-256: debce7b08f4afdf80d65be88542423dad65b664db607bfa89b8b2b3c70a7cdaa
font_01_sfnt_off00010dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E3 11004 bytes
SHA-256: 9351cff686a0a7436eb2543d7c8c45383ca96db421ad65cd5bf102276be069c8

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