Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c31e34e451c1c7…

MALICIOUS

PDF

91.2 KB Created: 2021-07-07 03:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 62b83dd4970877430c9216a76bb1d3e5 SHA-1: ce2afc7241c2561bc35bb311d5149ac4fdac007d SHA-256: d9c31e34e451c1c74284b3e1381dd443bbcbe226caea1cefc99dcd0219a23984
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF also contains numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc878c0057---7417180570.pdf In PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/27d9f892cf8531b002bb97b3f13badb9/ragexokovu.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/worupizemojovusaz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/aefffb9bacf5ur2hk5pq9c24hh/wozudaduxenojazudup.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/wikamiz.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/243fa9ae9943faaa8bb08481c7e089a9/40147820563.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/84875208612.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/sukezor.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/79382301643.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/79393171493.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q19f7gtia2jgv4ekalh4e86790/dalumedopinusepu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lanipajatasosakemopo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0a2b0f7e987b5adb88cf20e52c5d8eae/53441041244.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090a85142d2e---sotowopisudosipam.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d521f78c---lojexal.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/zasetiguz.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078332876af8---3541209954.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c220c485ba20d3bc4c8a0f88dc70a3e9/jewos.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6178d217ad---mimotenetuwadizanavoz.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/kovexivawirokulul.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6ec61028b9852d0ada55cd358c705f9a/13067704323.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/6f43ai7b6o1oafllr0l8bckc2m/genorejigejalarotidetadum.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ec19e283---werepajog.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/sucs00if91m268g2hpve2d3a64/15288717360.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/navelosop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=electric+energy+an+introduction+third+edition+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 18144 bytes
SHA-256: d64bde2b98138c1c8601d4e81aa8b3787ab5b9f2e29e3c1d3063f1f5e05554af
font_01_sfnt_off0001165e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 16460 bytes
SHA-256: f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0
font_03_sfnt_off00014569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14569 10928 bytes
SHA-256: 41688a13911bf1b51e2d5a4d6c55194fc043ca30a3c7562a41421433b476fafd

Open this report in the interactive analyzer, or submit your own file for analysis.