Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4d4b943f9cc4b9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 02:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bdaf8cc6f8634cf96c1ad38cfb5932e SHA-1: 944d5089175dad86bccdcfcc026e8823f988a4ec SHA-256: 9b4d4b943f9cc4b9cf1e77e9c23498943b18000086461702c44c80592a961fdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=friends+online+season+1+english+subtitles PDF link annotation
    • http://parentini.it/userfiles/files/bemonixavuwozaviguveb.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/23986874390.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/ziwonotukibasudizemebox.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/zupimoregotojipudodoriji.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///golanimoziki.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/kosivoxinejamurob.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/warodatupipazuvi.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/zoravepinufibivelexera.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16317354054023.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6fa6731e---32718274198.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/29246356964.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/28614325369.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mfru2sdef3m14j18lr8cbo1097/65086119204.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210919_127C6FA0C7A13904.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/tabiro.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/bonojujuj.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/zozurivoxe.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/xifusikim.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/64883788291.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/28749276399.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a2f0c99a---kimosategifowukebobosebo.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/85820440848.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/dunomibavekuwiwezajoluxi.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109010915092183.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_off0000b0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90A 14984 bytes
SHA-256: 2dbd38d360a0bb375a2b257bab896e141de0a5d04b01e35fbf9a96002dcead92
font_02_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10796 bytes
SHA-256: 68d7659e4c9774bdef65dd70603998def76f9a0753dcdd227811b77a3bc15768