Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6963eca89f7495c…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 02:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c3ff6e7bc878f5b0d1731976c9540d48 SHA-1: d42edb8d0bc7cc101b19921458ea4f3be5843d86 SHA-256: c6963eca89f7495c9ad8dbc5f15723ec18744e8f610ceffacbaf182e2f2e3356
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://catamma.ru/uplcv?utm_term=android+computer+app PDF link annotation
    • http://darangyi.com/userData/board/file/kotumimovin.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3a61b22be---14790222098.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/63727219496.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/lorozujokik.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/rulalajakimebolufizutaror.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/44168846001.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/bakasomuvemakigolinip.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/10941625781.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/21082153939.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a4313ef6e---8991446970.pdfIn PDF document text
    • http://onlinevay.com/upload/files/retipupekojunamobedelu.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/7150761691.pdfIn PDF document text
    • https://spacio.hk/attachment/file/24148441060.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/11801119540.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/18766511466.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/muruwuvusorebez.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/93486634342.pdfIn PDF document text
    • http://badgerhillfarm.uk/jipibefitujufalo.pdfIn PDF document text
    • http://iknow.pl/files/file/werekinekofa.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8eda1a36---zugagebukabezisugon.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/15801454490.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_off0000af89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 15408 bytes
SHA-256: 48a61af2d9340c35d660e35808825d9a52665b531cd6fcf5130c78814de622e9
font_02_sfnt_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 10540 bytes
SHA-256: 97cdfe1d7b96c52c9c61057649e95f310dca41a62ca5f37bbb6f4104f524da56