Malicious PDF — malware analysis report

Static analysis result for SHA-256 98bbff429008a98a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-11 13:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e3e7f41ca3303e3b08920c08f820f413 SHA-1: a33f88df3d8baeda2887409679e25d4c8aad0391 SHA-256: 98bbff429008a98af49a9d59a1d46b4ec50a6e11980108ef86397a10f51f9348
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many hosted on compromised WordPress instances or disposable domains, suggesting a link farm or phishing lure. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious commands or downloading further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://krisoc.ru/uplcv?utm_term=clean+cleaner+apk PDF link annotation
    • https://raiporjai.com/piceditor/file/bodusagadowomebirafuj.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/34067191852.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/nogerorimubo.pdfIn PDF document text
    • https://bfull.ru/uploads/files/resabeduxa.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/43603751510.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/27997522652.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/dijupodogegenewi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/282vj8sj7fcmfc466fdessj25l/65571209830.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/8607785646.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d89cce20---20255436892.pdfIn PDF document text
    • https://majubesar.com/contents/files/25105131092.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/99417922339.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/donaxoworaxinegobakixix.pdfIn PDF document text
    • http://qdjshg.com/files/file/bevedujujiguruwoxejesi.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-01/images/files/lupitudivox.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f418e041fd---97409421607.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc0d7723b74a32ad6022be0c71226439/wegufizatonofuzaweva.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/juvusuwogotepuza.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210910101428.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/kupas.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/90728027152.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/16350915145.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tidoxiderud.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_off0000bc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC77 17744 bytes
SHA-256: 5b34e1d0aea5c62960ef511cde7e8e8707d38fbf46ed53d4629eb13a900558d2
font_01_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001032b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032B 10012 bytes
SHA-256: 48386b75e3cb4f22cce439a4ccc502d0fd7a16d9af945db9e52f9226f22da12d

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