Malicious PDF — malware analysis report

Static analysis result for SHA-256 af247beb4c5b7ebc…

MALICIOUS

PDF

110.8 KB Created: 2021-09-03 16:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 968b4145200b8931983dfaacd10d34ad SHA-1: 7be25a543b8b6e816164b3551551aa96c4d19f3c SHA-256: af247beb4c5b7ebc380a32533d1effb907ec619a556611c77a7db8ad89d756c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also features numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=amazon+company+background+pdf PDF link annotation
    • http://4reality.cz/userfiles/files/sekumikofafugulemonamupeg.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/gupopenejawenobe.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/vulijemexazat.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/watevobokobulawupikejiku.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/dupesulutowuxiwobo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7922243a---45510602931.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/munopewiburevori.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1cf47d6a---26905729897.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/2ec8097b818019f6e99300ce66bb53b0/wotavonakemewowukupukip.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/71162701537.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/2104858925.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c37760dfbf---67647947515.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/fsdg3rn14i74f958kqqkabjiua/vorififududeforomu.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/37463528323.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210728111940661053bk4bjx.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/56268612202.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/7170970682.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/goxarifipate.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160813ff7f3c98---72479163650.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5iibjhqdaoc9k8ke1pq4a5gd14/93992335798.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210614_48A45E0FA423E7B8.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f471191a43---97711073906.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/zutubevive.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_off0001498e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1498E 19636 bytes
SHA-256: f74d84a3d61f54795b12b17df9011f4df1e5aa1bf881bce58abb78731297e582
font_01_sfnt_off00017c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194A7 10916 bytes
SHA-256: 812516249a51cf1f42280e7321a68871f54824d523e90488dc437510085347b8

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