Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e76819344c93d4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 00:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6515fbb5ff8eb06ea3b9da4c34dab7b SHA-1: fd178199001e4dc12bb69088e2d08ce335c05af4 SHA-256: b2e76819344c93d415d6d20bddec16d403ff78154f51044cad9fdf1776d54dfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/iqj2te1cp7h1n1notph536qdtk/filajorozidixarapunala.pdf In PDF document text
    • http://chronocertif.com/userfiles/file/62816766783.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090214530374.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/dududizuxosozapasebewogi.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/tesiloni.pdfIn PDF document text
    • https://aitalk.vn/upload/files/tujizobenofefiwozomatexeb.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/65730384513.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f00f22c---33488448170.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/83439819345.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/38757548799.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301f2688573---45476763509.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/detodas.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/55723321704.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/35770330481.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/ximen.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/30712561369.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901122431_5a57i2.pdfIn PDF document text
    • https://proxus.nl/file/rijugipogarebulesedemo.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/mapukijeromavepib.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/77219530355.pdfIn PDF document text
    • http://www.77ice.com/upload/files/65686909476.pdfIn PDF document text
    • http://grafitym.kz/files/file/97513255100.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210913_052029.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/jezowudinibidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pc+psu+power+calculatorPDF 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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10360 bytes
SHA-256: 51f3f06d3c4461ab492e8cb88f7f50db771f1655e611386d59df93876a99ec7e
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 17932 bytes
SHA-256: 9bfc1bda6ee205f568808938d4b74483c6cd356c0e8b626479e525c0047c99de
font_02_sfnt_off0001224f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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