Malicious PDF — malware analysis report

Static analysis result for SHA-256 52656a9359e2596e…

MALICIOUS

PDF

79.6 KB Created: 2021-08-30 00:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9f88f17e9ae8aa8134fc06bf4a93d3e SHA-1: 3d223f476532dffdd8eb4ba9d91653a47e36f5d6 SHA-256: 52656a9359e2596e49f0df515dc3cade188d166d1ac30f605af6dcb3169fe71e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://andrejc.si/files/file/banumerum.pdf In PDF document text
    • https://fl-forever.com/upfiles/editor/files/modikogamafutotokilub.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/12ce971ff19e3e86aa8f44b1c8be6689/42642596143.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/bisixikukamati.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/zumudejilowegu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102d2e64550d---lomanopazedikirijiribipew.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a253f1ba504---kikilenov.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/rerer.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/50034553599.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/vafiferixowule.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff41744d1---gumuverebiwe.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/l5023q8u55ja1k7kcn797d9ibj/21455084434.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/f3ek6chpqtemllri4svpaftnf3/56161274278.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160afa95b86f67---rawejibusawebibawak.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e0c2af96affa20a520f09d261f1b1071/15315364481.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/gujamumiwabudizilifemexe.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/rogowagedovad.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/namog.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/35704170170.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3798c16fa---fikezozopibubisiba.pdfIn PDF document text
    • http://nature-revive.org/files/file/nelizubajite.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/80580996527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=iso+games+downloadPDF link annotation
    • 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_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 17144 bytes
SHA-256: ea79314c7e4d6bba7af32beb4bbe436c8d5b92f0c0493f666199f597f5fa544c
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 10336 bytes
SHA-256: 88fb411c8dbdc35ef0ecf0494a101027687542ecb6c9bd7557b2761ff4125ace

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