Malicious PDF — malware analysis report

Static analysis result for SHA-256 63404fb2274d6d79…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 15:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 59702314d8f96aae0b4e82be6fa90e4c SHA-1: 598556634a714f209f7f3718936d491b91c1445d SHA-256: 63404fb2274d6d79bbc5a99d5cc69c80e12b21075f2d6a45874e5900681e70b7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It functions as a screenshot lure, presenting an image to trick users into clicking embedded links. The numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggest a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=helmholtz+on+the+sensations+of+tone PDF link annotation
    • https://ymvii.com/admin/upload/files/32080912057.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/dirake.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109090633575071.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/doxefefoburuzitaga.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/73752223831.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/vasizodonivesidumabirarix.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/80513643337.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/ronejomol.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/sesenirefinexop.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/7880897742.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/90321224171.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/xidudela.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/11784122391.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vedawitamirux.pdfIn PDF document text
    • http://odumakus.com/uploads/files/sunamudewala.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/ea5bf3605fc6b31e5d85b5b85eafe16f/zanulinujup.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/6054126992.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/37286487735.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5f1ba78627d5362e6b09d4f83ef0ba7e/55387690129.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/76777737857.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/59778304725.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/paropedugemulin.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d060d0c958768b6bae7a3a1c603e3f8f/49611064635.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_off0000b123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB123 14064 bytes
SHA-256: 01fe22939b59368ae8789240dbf2aafe568d26311d8d4cb143c0bb9aca232d87
font_01_sfnt_off0000d3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BD 10428 bytes
SHA-256: d7d01a9ed32148a8bcced217bdc59ec25536589b9c6764daee432127df52c1a2
font_02_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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