Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a4d4a390624f0c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 06:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e5af42cae2566d18bebff3cd07043c2 SHA-1: 769a60ba841f504545be48c21e800ef5e5e87efc SHA-256: 20a4d4a390624f0c9faa4d1a2959c9184f34645615dbfb12af16522ab7f2c4c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary function appears to be directing users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://llsindia.in/FCKeditor/file/25858025921.pdf In PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/kujexobuxoduvinetujefuma.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a576d599a57b8094073daaa5c8353d13/23974426997.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/wesinogowa.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e71a58a2af1---69443603962.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/sizigolikomovavixudi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/651744870614cc404f79eaa8bec381cb/kapefodigopeseguf.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/sutuzenugirebitopelijos.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jilekisekarijotexabijib.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/37613279562.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/58326382834.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/sufimuxamid.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/lefigej.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4b864dac4ad3298b0cb479a7845fd6c2/kepisaxupewifanoji.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/zuzoruta.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/40a6038f2bd53f808d365a060c41e43f/gasipuwakikebekejeweramo.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/polojowumil.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/lokipawaguxugufi.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/muroxevufogepepopuja.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088765d9b143---telasazugaxojofozo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161028e4c910e8---fagezosudumi.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xiwekazos.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/fabotubiponujumuzuvaja.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pijumukos.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/takovunalusesapadurumide.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/62378533210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fichas+de+domino+para+imprimir+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_off0000bfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBA 18304 bytes
SHA-256: 2d71a384437799221b3bc2a39b7d20dee9112ba4956abd6b2b9c873bc3e3b06f
font_01_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 10720 bytes
SHA-256: 53d4b12676ed6812509d6b64f11410fae132f20f17251a0824bd927581de28b6