Malicious PDF — malware analysis report

Static analysis result for SHA-256 1703f924ca9c2d9d…

MALICIOUS

PDF

89.7 KB Created: 2021-06-25 23:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cfce56a56a7992f32487089e782a4498 SHA-1: 685130e881894067b75f3b20bac3933fff0d115f SHA-256: 1703f924ca9c2d9d7cb959010f3956f3cc145a602be76fd8bc53f321d08d6e08
156 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, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via these compromised hosts. No scripts were extracted, and the document body was unreadable binary data.

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 http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073175144137---4979641226.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ac4f0be5ebba7607611f39e8ef617941/pofixetedufofolozux.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/463ab4e49fec4f58079b4b28e2ee6816/15967607083.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/91299225413.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa438b9e6a---48330353818.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5864dc0800---61597486887.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3b93b16746f3fbe863a06cc5d98b74fe/62972727026.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/61300543294.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/nusajivikuji.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/6141150044.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/67135388151.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607240bcd7943---72465917384.pdfIn PDF document text
    • http://artospace.com/pics/file/23171535090.pdfIn PDF document text
    • https://invest.pl/userfiles/file/gugusaw.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/958267c2af2b90f1ec136727e6963364/56182761378.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/gevawezonesajizu.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/9712432694.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/26kfnpfatulhponjo5m81g9dmf/2351022215.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bf87b658---tapezano.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/4fd34372acc9da3c5b88041055abfbf7/mafudenojujenolidelodoxu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af57650a8bd---xisamoxezebimotigin.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/lc007718indttkns3brprff5bg/99845481292.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=i+wish+you+all+the+best+for+your+futurePDF 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_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 10596 bytes
SHA-256: 23fdd664ece88e4eeb9584d707288a863ebc91c7fa28d268bf94ad079fa049de
font_01_sfnt_off000116c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C4 16408 bytes
SHA-256: 1a1e4ad9901e3c42d284b25cbb81d0eca3a620e1f5d1ad39d12276f29d963b6a
font_02_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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