Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d9d1c5cb3330af…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 15:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d49c63ea1010f8056396b770f2316c08 SHA-1: 8973c02786c91e0119660af387b010fed49d30de SHA-256: b9d9d1c5cb3330af0461107fc3eea43ad8daa8a37e7ce5536a4dd9ec142c39b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely serves to further obfuscate the malicious intent or initiate a download of a second-stage payload. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ilovechardonnayhills.com/userimages/rilisekilidubowi.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8b3e044377493cc656af06f5fe425461/14245176437.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705eeb76029---99767701689.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c545f3e2928423c38d9badb6a46cd2f2/dilam.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/tomol.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/7kk0cfd3d593eng6jbbdvfo76t/vimuzevowolo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/07548013a8d919a2eddd37f845321f3e/78169099562.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/15518474481.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/48091028097.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/73080304170.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/pixegibeloruniz.pdfIn PDF document text
    • http://chongros.com/userData/board/file/dunexokeburunuzuxotunij.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/nizevajemekelogefegepatog.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/68851611865.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/xifigatutomuzomejevigeke.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/zewal.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/20657389242.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832b7af1ef2---pasewuwakeg.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/ranulutapis.pdfIn PDF document text
    • http://ahchala.com/img/file/xudikukazubikamiwos.pdfIn PDF document text
    • http://pneusmarene.it/images/file/nadesamaboligu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/77360955728.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bfhi8f6rav0h7k95lcvtcg1hdn/79606763628.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdq0v6ief4ps5ss4sr850aq96a/63773586822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=effects+of+cutting+classes+pdfPDF 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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 10776 bytes
SHA-256: 2c8c5daac8d73b2c0d79e09c58bbc1b67737cbf1fd20f38243f0d5044c993589
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 17068 bytes
SHA-256: aa22357d1778e35b2716c76ceaf84c8bd0d675d152fb2b998261dfca223c7f55
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1