Malicious PDF — malware analysis report

Static analysis result for SHA-256 deac57dc4946df80…

MALICIOUS

PDF

76.0 KB Created: 2021-10-04 03:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 96106390e7d57a5ea07b767d3fad2a47 SHA-1: 4ae9f86eb0ba7c749038ae48454f0404910f8797 SHA-256: deac57dc4946df809c0757ba9f94f0500fc66f340fddfa79e96f38127ed8d076
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=slight+lateral+subluxation+of+the+patella PDF link annotation
    • http://trevelci.ru/ckfinder/userfiles/files/wemepigaseberadukedazo.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/37680500225.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/32574026574.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/2458511197.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/39444347436.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/58603150928.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/16073591899.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xowogasaz.pdfIn PDF document text
    • https://matricula.arendic.cl/files/12157115501.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161529b13d398c---jazuwasibapujigux.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/xulivizafura.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/zojibufusifababi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159b8adee176---mitadapigenibetan.pdfIn PDF document text
    • https://soechi.net/userfiles/file/kobulabodavazozifa.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137501d99e7b---bawog.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/92242009438.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210921081219.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/xunigapunumadivonamu.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/55912988764.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/sanefasodiged.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564d36c718c---pigodoxiluwedejurofowura.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_off0000bffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFA 18776 bytes
SHA-256: ef4fda119e6acab5f118bbd0a36e8df4a0f1c82803718b27cbed9467b1c80369
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 11052 bytes
SHA-256: 36a83cbbade07a7b5c9b44cac3f81bfea2847e45e42da73e712e03dd7e03fb82