Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4adafac53178cc5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-14 02:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0cac30e3b7db819b8fe3eeebaa506aa9 SHA-1: 9aa257539a375d2708eb2293a3ea8c062615d029 SHA-256: d4adafac53178cc50de61f61e549a672739eb0d45eadbe8905e52d5f95130d16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://jeykrishnaclub.com/images/file/guwazapedirumalofe.pdf In PDF document text
    • http://instant-image.net/UserFiles/Site/File/11988326834.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vejuwigepofejigopefig.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3291ddc3912f4c337474fd95217d5d57/70198277891.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/sonitarumapenusa.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/81918446544.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210910_12B7E1E26689644D.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39251582274.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/koberugukali.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zusolijerodetafuvefowaz.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/26156657918.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/56547943772.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/botivasezilulasaja.pdfIn PDF document text
    • http://usmleworkout.com/files/file/7082018195.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/vobez.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/dusekitemovuvegiwikuxafu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3ll89joq91l5ccc7auqhhq1cnp/59154363156.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/6213951568.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/89033520435.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109061108286941.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/90534468082.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/bazabuzo.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/20108562422.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/48219801127.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613effd187860---68109023992.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/42184549767.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/65522967671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=andres+y+el+dragon+matematico+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_off0000c1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CC 17388 bytes
SHA-256: b41ff3e0a37a01d0b250bccb7bfd1310f7c9b968dec0f3254af5cd1754b93496
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 11056 bytes
SHA-256: 2620ccac9f71253c6c31d7cdef7ee4119c909681bb1742435fc9fb9bc5fe799d