Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55f8ce8ba1f563…

MALICIOUS

PDF

86.0 KB Created: 2021-08-07 13:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f23ccd7619dc7549800b3b3055844842 SHA-1: e8fc97cc37cbc5503723b5aa40c2f1f7c61702cc SHA-256: 2a55f8ce8ba1f5636f04b03d6c2ee36884456c1a5134830891e59eab8b302c2b
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting it is used to lure victims to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=how+to+lock+a+row+in+google+sheets+so+it+doesn%27t+scroll PDF link annotation
    • https://riolospettacoli.it/filesUploads/file/fudukesafemogolu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e3a76a138---savume.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ch8v0arc1g32q2tegeejfpcmco/jamazagazotagexez.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/98284407616.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/6651423055.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa7d2ad9fe---39401108276.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/sugatemoxakiregunovaf.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b05f21978a9---22413626784.pdfIn PDF document text
    • https://bonacorsi.it/file/tezoperosusedixoduf.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ebe157cc4---nekefufajalinaxufapak.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607681e04da43---43282200257.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/35630466842.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a6f0e4f34757288e2f9af862d2f7b509/zefag.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/84603750068.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/27081cb9c5961b72c3c47fcf39ba1aaa/jawuwisulem.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/mazalatotezupopuli.pdfIn PDF document text
    • https://ms01bet.net/contents//files/kubigepejajomigebadilowag.pdfIn PDF document text
    • http://charivne.info/images/file/lofeburasikekuli.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/nilisipufetidabanonita.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/femefik.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/82231698887.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1eab54ea5---budexufumilejejimawalud.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/86378149928.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/87586316757.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/95305383889.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 10852 bytes
SHA-256: cde45b077807d2b43cc7d79acb5ed6c592a7d31f98e07790309d8ae553c5d82c
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 16924 bytes
SHA-256: 60b1c4c6c5e7f22b45600c5bb097901c2a2a9d0a3b3060b32cb1965f65e03f44
font_02_sfnt_off00012f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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