Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e577a5532fcd4d8…

MALICIOUS

PDF

71.7 KB Created: 2021-09-16 21:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 57f8c2e463de2fc87b20fa583f7bcfa2 SHA-1: 01277b0099afa0f69ab422b9f60509be8a692caa SHA-256: 0e577a5532fcd4d85f8a7417a4078e7ed2b0ad1ece05d282032a04b0aee856fc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.integra-cr.cz/administrace/ckfinder/userfiles/files/juvafivutusuvifin.pdf In PDF document text
    • http://floral-design-lindgens.de/userfiles/file/vafafurinibuzudokasizu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/gotivax.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6994968896.pdfIn PDF document text
    • https://membermimpi.com/contents/files/13037973710.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/zafusevakazorazatinom.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/76288097552.pdfIn PDF document text
    • http://scro.ru/pic/file/sikisis.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/fovozabuwosovilejoza.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/39581886142.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/8856794756.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/76721420325.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9d65389d---nameboporemowixujasimex.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/zibutapesutufebabusu.pdfIn PDF document text
    • http://net-marketing.hu/images/files/47031324016.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/reretadifesabitata.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/74423458291.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d57a7fb550084b12ad22fda8fc5498e9/30851520607.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/wufenafivevisoviwetuv.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/40503595274.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d4f2a0b86c6acb9867c60d393edb043/tumasiwimadobuxawasetige.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/45135334002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=line+unlimited+coinPDF 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_off0000b7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 16708 bytes
SHA-256: 0507a82a4baed7077b454dc3b4ed9904162791b63f7b9564d5ed96dbf1f8a884
font_01_sfnt_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 10156 bytes
SHA-256: b1a33be3ba897498cbb9eb69e3f2d2776d77753a60fbc3026f33b3511d5e16a5
font_02_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1