Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5da57f1b94163ca…

MALICIOUS

PDF

68.7 KB Created: 2021-09-28 21:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e76ca05af1a6809974bdda49f167a00d SHA-1: bb514e9e7d7992a5f9c63b67002c72f096e500ee SHA-256: e5da57f1b94163ca6daedf31eb66e45d662ef064fb0eaccaa9e6be1554342693
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of embedded JavaScript further supports the execution of malicious actions within the PDF.

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 http://jedzenie365.pl/ckfinder/userfiles/files/94898133814.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615046d6df787---tigirivedaritudimop.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/jowunoxekupasa.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/57067976607.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/79267630343.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/wujuludibi.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/79576089493.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/vanamuwetu.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/45003789599.pdfIn PDF document text
    • http://princeverma.in/uploads/files/56990968894.pdfIn PDF document text
    • https://oasis-travel.ro/files/fuxokararugig.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/79325738468.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/14039787448.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/luzarepasawabadaf.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/puzenex.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614f208f23eaa---togasamugudukigos.pdfIn PDF document text
    • http://shouquan.scarclinic-cn.com/uploadfile/file///602408503.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613315dc0b46a---95146983212.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613205544b7a9---gajijujuwelad.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631596509.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/gubetesemekub.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/29927071883.pdfIn PDF document text
    • http://partiaweb.ir/upload/files/woxefokorezikevag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=positive+letters+that+start+with+aPDF 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_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 10256 bytes
SHA-256: 355cae84e97c5a84e89801be76f59f832b412ae4c025e9d02ccc7710ca8493c3
font_02_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 14520 bytes
SHA-256: 8768c0656cc24e58ce59962df757a229ecbf2ab034c5cc0dfa5ad52fc902a510