Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc65a7e54bb2d846…

MALICIOUS

PDF

74.4 KB Created: 2021-08-28 08:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4d22deab5fa84f27036f95592f1dd9b SHA-1: b5ffaa2761ad50cf1f5a18a5be0f04bf5ffe1d10 SHA-256: cc65a7e54bb2d84604d3c0da4f0002200815f128b3d5591e0ed8f3aa44567abd
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and IP address literals further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=what+does+stasis+mean+in+medical+terms PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161045f6729e58---81783570528.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/37723168561.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608451d1f0696---86135363051.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/25615027902.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a019de10b8---xekewudij.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/26218766347.pdfIn PDF document text
    • https://o-dance.com/upload/files/30573966921.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/36086831948.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/652622e8053dc5a3d25bfee2f22cd4c6/tixanet.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1cd2a8396c---5658226142.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/bedej.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jetokavifobuvixiza.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cca58ee5a---86485439655.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/fefirenosajevoko.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a97421451f---zawerunerukigupefupenojuw.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/c3e0fd2ef0c09b1f2ec5baf55a6068ca/80590503495.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/bifaki.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/70334536853.pdfPDF link annotation
    • http://usagimatur.com/files/others/39412519598.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/19417538235.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607543754eded---gagejozaniz.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/vokasebijesurawusorivu.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_off0000c026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC026 17056 bytes
SHA-256: bc128c19890f14aeca515679c62b47360bae9871bd6a26a50514d1ff9365ba16
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10628 bytes
SHA-256: 34d8d9f76c030cde718ba1a0f7d34cef0644c308aa4d63e07d2abb94aea789d0

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