Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd246a5e37d16df…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 07:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42bd626b02e3f64dbdeb2d7b27a3df2f SHA-1: 4bc0e2a6f0c3b6118c0bc87747b81a8f66c2fbf1 SHA-256: dcd246a5e37d16df1496a6fa47d5d0df814422a8fa5b0d1b129dd7158afe6050
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristics reveal numerous external URIs, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://infrive.ru/uplcv?utm_term=robbins+and+judge+organizational+behavior+18th+edition+pdf+free PDF link annotation
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/79a963fc24a781020d97c81505a748b0/botovegujituvikuguferas.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/39812920831.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/dobabeleleniwidil.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bajilekalozufuwewuxigas.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/sokaxipade.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/pezuxuw.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/26101727404.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/salidovisuzudipudagimaxu.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/71293180222.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kimebitabiteseru.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210910071020.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/vunekimemi.pdfPDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161343fb8a2c3a---32777592227.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/kalukikerepekozik.pdfIn PDF document text
    • http://fitviewer.info/files/file/mopakesetenojix.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/38985044394.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/eda32de7638f1b98c1d63e69b4908d36/gesugusinuwabenokosove.pdfIn PDF document text
    • http://akademibt.com/resimler/files/dukarebi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613864fcafed7---16839019173.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/69688959707.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/85205101083.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/lusix.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/80255040141.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_off0000c794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC794 17540 bytes
SHA-256: d946be6b1590ff2bf7732224923e59c73793c3cd9bf64aad46b650d1b9bb2ac3
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 11580 bytes
SHA-256: 177964ce1e4f0de930cb92c968d8b2b49a9e38e3230d00642d33e46e3ed2e524
font_02_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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