Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee441a837578b90f…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 05:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 675adb1b48e14f1e72974204f815c986 SHA-1: 6ba7f9cd326b4275e42a3b72437c5111712a4014 SHA-256: ee441a837578b90f1c1c1a31aea706d383895926b7db70218e87066ade15a37b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware delivery vehicle. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=watch+sanam+re+full+movie+online PDF link annotation
    • http://wxbeimei.cn/upload/ckimg/files/202109140759361317.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17108343e85a296aecd7a1fb103cb97a/valigabototiri.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/tusadalonusudulovexi.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/wepuguvamaxomiban.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149a2e538069---66932031620.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/7967233340.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/mozilapavuged.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/vetefegalabam.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1614709749d9b6---40003821354.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/xugisilew.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/39762381641.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16148ae9880e60---85145136311.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/tozezakutazudajup.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/sabazafazorisimutafaxoxe.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/830731667.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/22623010412.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109261116453719.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/vosafofutasikirido.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/17267589835.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/liwafexinovazujiwapujib.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133f06c6d0ed---petobinejubul.pdfIn PDF document text
    • http://goodmax.ru/i/files/22799922455.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xujawovujetifinugifuze.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_off0000af99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF99 14524 bytes
SHA-256: bae8f0355665863517f9d57f7bfc7e9fe7878ac55da95baad04e4eb48dbcfc23
font_01_sfnt_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 10760 bytes
SHA-256: 1fda31163d72630824fdde44673f39c7eb1bafc2132c10a3c74720a875eb195d
font_02_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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