Malicious PDF — malware analysis report

Static analysis result for SHA-256 984e8a3b13387d8c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 19:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3efe26044c70a63d28ed6d921eaa952 SHA-1: b69f17fd9d90a98abc5034121fcd01001daf5045 SHA-256: 984e8a3b13387d8c72511775b599530e41c1a73627d8ea0d7871b7808c11f22e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. Heuristics indicate a 'PDF link farm' and 'compromised CMS upload link', and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=cara+login+bbm+di+android PDF link annotation
    • http://cathugo.de/res/wysiwyg/file/sutagufakaxanulowizov.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/1989928200.pdfIn PDF document text
    • http://mobitransjogja.com/files/dawakutikexigizor.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae50666d8---debufagevanulawaxitizogar.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309fb795f3b---newom.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/zugoke.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/54359402549.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/87019318613.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/94130924369.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/41072523793.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bb3e0f1eef2fb1f2c64dd9ed448bc424/fixapurin.pdfIn PDF document text
    • http://adriennemason.com/assets/files/varebugape.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/47455091731.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/8193769490.pdfIn PDF document text
    • https://buyafranchise.org/files/files/sowakinarovewututuk.pdfIn PDF document text
    • http://orlickachata.cz/files/files/95941085208.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/tovizerinadivofirisikodek.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/70287203205.pdfIn PDF document text
    • http://abnicum.com/files/file/11237134448.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/37855486903.pdfIn PDF document text
    • http://orem.mn/uploads/files/20374855762.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/bamowiwibekudu.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/47662706709.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/kuzosare.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/mujumejud.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_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 16720 bytes
SHA-256: 79454404d54fbf53d50946e41163863c55a1c0c660c1deb877bf8db0e004ee01
font_01_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11637 10364 bytes
SHA-256: 7a6e41c9433f8832bdf8cd09745911110411ca42a44e5e796aad57eba8f5fb14