Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ddc2ff061690ca…

MALICIOUS

PDF

71.9 KB Created: 2021-09-09 04:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d196129b675dab2bad96b8be6d4b5d65 SHA-1: 097badeaa2e1a59a3bcae2a67cd175ff1d7ad885 SHA-256: e3ddc2ff061690ca0862be962cf452a711972e1e1675e2a146067535390ecd6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The primary purpose appears to be directing users to potentially malicious websites, indicated by the presence of multiple suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://archism.ru/uplcv?utm_term=video+player+pro+apk+download PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16133d787c5c62---24549713443.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090701162673499.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/goperuxupobozugatogitowot.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612eedb9797a6---17325908556.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kuvifixokiwopidumes.pdfIn PDF document text
    • https://izr.fr/files/80152049677.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/fukaxugasokoputofab.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109050856157580.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/40271417764.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210901062126200318940.pdfIn PDF document text
    • http://446888.top/userfiles/file/logeraxe.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/85373020771.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/69416452265.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613925aa7c17d---jukerimig.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/feturijerosofe.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/xudifekufef.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/dukidu.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/93356715889.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/roxibinosebekar.pdfIn PDF document text
    • https://jss-moms.si/upload/File/19452093269.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5fb558972---34203423318.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9eb1ce0984accde864b15f0d86f1a723/rexijaninofewizisavakoz.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/fexobijukuzimamukavakawu.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/mexasimajulanezekinobi.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/borojufurarided.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/nexunegidilawasivekuwume.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/pefejokog.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_off0000b9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BF 10380 bytes
SHA-256: 60db8360a94441fd00c3176e382b13bc18a0e9d4aafe1d785c3dca9725dd4d13
font_01_sfnt_off0000d154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 15960 bytes
SHA-256: 4fc079aadfc5b214da0b6fa83bf2ed12f0d9c4b0a81c1c38660fe1cee7016399

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