Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63bfe34805b8cbf…

MALICIOUS

PDF

83.6 KB Created: 2021-09-13 12:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4a7f87d67926513b650e72d94ec0bc7f SHA-1: 4c85c274bd19728829aab9e032f50c0a8770bf20 SHA-256: e63bfe34805b8cbf0790b5c6edbb8192c9fc55ef7d0604447533144e197bb505
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://rowadhr.com/app/webroot/upload/files/27297481807.pdf In PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/33197795766.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf6e85d8b---dukisuwilabexexuwevupoke.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210912_193145.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/19831604892.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210909_201137.pdfPDF link annotation
    • https://ubk-sad.de/azubi/userfiles/files/35866236647.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/67704506141.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/17540698331.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/33602791805.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/jevanomidipupenov.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/34940370260.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sazulamivadojawerokipej.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f1c2b6d2---79648042361.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/tezoferusoworaxofuvowame.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/poropozi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16139c4a421abd---maboriraludeb.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/47861ehv8ictfap97g8feef6u1/64008024755.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/18959247223.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/20138994129.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/bivusenixisina.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/45057277225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sockshare+tv+showsPDF 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_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 10404 bytes
SHA-256: 6f23f87535258419ed01a1b51c0961fafa542f0f84a45c58d59108b71677e9ec
font_01_sfnt_off0000f8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CD 18584 bytes
SHA-256: 088febc8c0ddb6099d89a34b49c635a76b5fb57cdfa62eafb4e137b0ba7cbbae
font_02_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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