Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64754c562e55ae2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 22:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 082a854b593acba65caffb37a0f18e78 SHA-1: 0b6041644641cf589828fc313e7e7cdec73673bf SHA-256: a64754c562e55ae236270a12548821157468293b04ca9bf4fc112c90a1d1e3e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=how+to+turn+off+group+messages+on+android PDF link annotation
    • https://lochoanggia.com/upload/files/turowijelik.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikepu.pdfIn PDF document text
    • http://samtekelektrik.com/files/54016503033.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/66869822844.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/tosilusuxaxu.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/11083141394.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fbd4ee5db6ab23cc1d4aff8651a881cc/rebunimekuxumogeb.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/85202470146.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/sevawenagujutotevutem.pdfIn PDF document text
    • http://grafitym.kz/files/file/sitinireniruvuronujinu.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/mejumavude.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/venoxofulul.pdfIn PDF document text
    • https://nyig.com/files/file/48192781442.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/10707682693.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93343147861.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/47704263500.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210910125818883071tyhd53.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/12361755293.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mitunalunebedopatijikaxo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb39143d---44370810419.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c227aa3cbb---wabifagugivejizu.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/jewiguxoparamakexuja.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/vasolarop.pdfIn PDF document text
    • https://forums.androidcentrIn 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_off0000cfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB0 17192 bytes
SHA-256: 6497c3a507758bd153877450b7955aa50f37d09dcedb8a159415f41ae62b3c4b
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 10972 bytes
SHA-256: 2c721348e2b9d3ab8d98ec3539aa90f5f0c8699b80e1723e2457f6fbab1d7ce3
font_02_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1