Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca544652c918c7b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 13:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 341189abfac68ce49584bed6f3fced8e SHA-1: 86ec519db99e786d6d49fea8bfd1924d8ddc7650 SHA-256: eca544652c918c7b018b90cddc9f10f826e8816ee5b8f29a39f54ea05fd9975d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://smidgel.ru/uplcv?utm_term=similar+sites+to+bedpage PDF link annotation
    • http://kimyasaldubeller.com/upload/ckfinder/files/rovejuwowakabukemetos.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11629b5934---77319739655.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/923842a8fc03cd355cfa5b93ebe219f7/99377060032.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850fabb0605---pobugemojari.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/21247964232.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/wadereralun.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2edc2cd0725c12a160b8ba4c2c20843d/44461572308.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/gagokiwizaxuvaf.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/2134acf5deacdeb5a2c1514135b24b5e/nifanonemozuzinobifixirew.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7ff6e046---24431868388.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/7761330704.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/3f02b566e9c17caccf84285b925be8ed/bodar.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c7674acf---dezax.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/48741976275.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/fojavarizerojatu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210604233115.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/memuloduponodi.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/47315135972.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/h9lgm82t6q26tibauoanisid28/51466381711.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/10d48e90c707e10fbeb2e517abb09dfd/borirawonizavezuwa.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/e67c5589d0c606159d47fc022f4f0bb1/sojelinemexotoja.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/tajetimexuwinosanolitobuj.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/4dfd8d760c733e956057467a059f1a12/25770048994.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xisegigex.pdfIn PDF document text
    • 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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 10848 bytes
SHA-256: 3e78db0543b82c269ed567aaf832daffd33cf6f4e398ff67e4a76ce26b6bfc6d
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 18332 bytes
SHA-256: 41da01fee6a309d8f82302efe76b5e78acbb2a7978d135722fc881713e1a3066
font_02_sfnt_off00012f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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