Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca3e2b1ebe8c135…

MALICIOUS

PDF

80.4 KB Created: 2021-08-16 08:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57014e4c92c2e1da5812d7e5c0887f4d SHA-1: 47476bd01c0e8e354c444f8963b4a67e142c31b8 SHA-256: 4ca3e2b1ebe8c1354a86f46d585a4102802362b1e63b46dc6229c4a952efd92a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting. This structure strongly suggests a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://beauty-full.ru/uploads/files/xawebabirazakan.pdf In PDF document text
    • https://izr.fr/files/4613204424.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/16707267849.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/07/24/33700292044.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/81601765558.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a3f661a7e7a9d549affcd2502da12129/13628403713.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/84931817558.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1e545940---nisivivi.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/bibagiso.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/0d00128b5dc29e827ef7fa2503b542c5/81663499418.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6f2e4cdfbfaf81fb71f563de9b66b587/jujawivosavidawutasus.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/97971158094.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/8881320366.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624928572.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mhg0g57hu7joj7dbsh5irdk496/vezonugapanijagagamun.pdfIn PDF document text
    • http://lyshiying.com/d/files/43052899573.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f008f0e91f---86354871746.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/37e409d0c862fc5b6c2243e4d386d453/69277350478.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160770161dee8e---nupegegejolexaditekujix.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/63557522126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+free+eyelid+surgeryPDF 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_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 16644 bytes
SHA-256: 0e91ca84c019c2c4a0e7070566f76824148729300aaee5002aef8bb5e42a2a92
font_02_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10556 bytes
SHA-256: 65084bc55bf7d745f66522223c3b0752375fad332919ec691a987af2daa1fada

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