Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f27776084ac00e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 01:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 421b3ebe25508941a359267e91028940 SHA-1: 4ef283337df9b1ccb6c5726ee73da3247b4b38f6 SHA-256: 57f27776084ac00e44199c76daedeecd68c34f138f5909aeb988d7a9168cb237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=mobdro+shut+down PDF link annotation
    • https://sssmri.com/ckfinder/userfiles/files/bezewukikep.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/38547418085.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/remudevodofa.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/43343108847.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/buwojuraduvopewasapogiwa.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/newokiwibedenaf.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/munovutadegutixosen.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/tigolonimanurilovif.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/nozugekazitevigesiga.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/4726989732.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161401bfd84ed9---13003931009.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/75564947741.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/bozodumefuseputolulu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6df7ea6ceb3fb62b45f7c889da2e31c6/zavuda.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/kesux.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/gumupekater.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/40661589084.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/ziwitu.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/261168384.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/69371913624.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614038e1d1100---bidodakar.pdfIn PDF document text
    • http://hueide.com/upload/files/vefuba.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/mutaj.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/pezale.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_off0000b83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83D 16636 bytes
SHA-256: 2a3ef6f33e3785c68e38ad5b1d9a8f11f7b9d4ca183917dc15b77206f31c2275
font_01_sfnt_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 10232 bytes
SHA-256: 3e460d063ea6b46c2be6eb3b9c4c3543b8964079e6b883e22d1a7c4920f961d3
font_02_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1