Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e44ae9a32d210b…

MALICIOUS

PDF

94.1 KB Created: 2021-09-18 14:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f629d0a62b66b40faa571a40fa9c611 SHA-1: 331d2a4f42d6aa6f043bf489b9ea237af6c545df SHA-256: e0e44ae9a32d210bf3a943b811e99fe778ac937f1d1bfc5df5abc092132b5e24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=what+is+blinkfeed+for+android PDF link annotation
    • https://manuscripthandler.com/userfiles/file/fujavaweraxagoduxapom.pdfIn PDF document text
    • http://kezmosas.hu/files/file/migalulumiketegodabavel.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/64384407658.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zewuwoxakegaleko.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/6244636967.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/68933826179.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416eb9b2303---43239758517.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/6799011271.pdfIn PDF document text
    • http://airzo.net/userData/board/file/jixofuwebejuwesa.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/sijumiwozijojenija.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/24300580214.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/supawelu.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/wevivexepegek.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/fuvoxabusiforin.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/wasozomilowen.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff31704bf---batob.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/bivizozis.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/52670414339.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/20700032792.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ec3a6f74---kepegowulud.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161428724cd970---lezolizol.pdfIn PDF document text
    • http://robbes.nl/media/files/dakabavobabijumisanuruk.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/kijeriwiwotasepujaxe.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/28926212692.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_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 18512 bytes
SHA-256: 7ee861b2e504358970a72de246c4e24d4a24dcf110e26b35ca09234d7c69a509
font_02_sfnt_off00015283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15283 10676 bytes
SHA-256: 278ef0e4d0c8b205d1a330a3a312c06178cbbb5bcbab4cfdc573c1c79df88d8c