Malicious PDF — malware analysis report

Static analysis result for SHA-256 1239b1142af04fb0…

MALICIOUS

PDF

85.0 KB Created: 2021-08-31 00:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cba278c9c5a19471e97338273529a18d SHA-1: 1991d45ef1cab84cf2e1b4c216b5a14e5a68fc3b SHA-256: 1239b1142af04fb0eeffea8cf3fb331d07f0298cb5625e74694606094e90e8fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.awakohchang.com/image/upload/File/okujowujodusas.pdf In PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/taxizarowat.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/nupuwojowuwatu.pdfIn PDF document text
    • https://stopserv.ru/files/file/21655115308.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/70bfcaea8a827feaae2f6b87f3017140/37673519694.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e6398c9f6c3325a8b4284232c3513316/nisepuwudupi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210515155920321.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/6820007113.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/27540022508.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d493cb0687---bapizipanisiso.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/kobapepotojidexisegu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/86364503868.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/januji.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c184cae8227---17410472982.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/vopemalizawevo.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/jexop.pdfIn PDF document text
    • https://sanagustin.cl/files/79803451420.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5ls9kqcak35uudhbafqiipqnf5/67301713725.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/8a9fc0397e35a1defa168f8d321fd761/vetapuwisesirudif.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b1895e52---37698367722.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/ledoxemekupof.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/74f9fed62060d775532194d1281c8179/8211324039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=specific+glute+exercisesPDF 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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 10544 bytes
SHA-256: 543559b07a5c24fde9848b2e06d1b66f4ada5c170b5497e24e252d530bb37ed9
font_01_sfnt_off000100d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 17360 bytes
SHA-256: 82337b9ec0a475cad5aac879399160a2c9dfeb00267421dcfd04f35a0e27e22e
font_02_sfnt_off00012da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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