Malicious PDF — malware analysis report

Static analysis result for SHA-256 889500ebdaec6bd5…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 16:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fbba87b5e5ccc081e6d3ca9590c323e6 SHA-1: 9500fcc00d8d3d2d3951daad8d477275d1e12aea SHA-256: 889500ebdaec6bd56010d7fa4bcbaf4e24b656d4adde0476ab3d24e640e2e957
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. The PDF also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/bcb3aba536cbcd37530861355b34ed7a/mufidumifuziza.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gj5mlhl7flv3e9fhrpk0a625p1/nolex.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f7eccf86c1840326cb786d4018e1cc83/soparifiw.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/lideza.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837bbd016ea---dezedaxalujulijalite.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/51751694549.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/gepabuzasarafegurasovud.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9009d8660---molixoxajij.pdfIn PDF document text
    • http://asustainable.com/global/file/60631261423.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-25/images/files/tidosuxoxofovifikuwemeros.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/weribaxazewunog.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/pupugexasejoko.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/dexarezezagudusenixedor.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/81899318594.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/tajovenazujikotigomuma.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mufipiwal.pdfIn PDF document text
    • http://bacviettech.vn/userfiles/file/23741792234.pdfIn PDF document text
    • http://incoyun.com/calisma2/files/uploads/golumemumiwadodewawelol.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2c7a9135639c4a96030d4a1f1d6dde5e/serikelafoxebibij.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ba4baf5d43bc7b1a02b150b342b7ff3/17956043122.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/83410611576.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3efe5285729b04c0cef7236a3b833d15/51652485413.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/gaguviwujevaronepisefid.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcfc4c18cd---55657466976.pdfIn PDF document text
    • https://go2germany.ru/files/file/juratuduvaramufuw.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/82288313784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+cut+a+pdf+into+sectionsPDF 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_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 18104 bytes
SHA-256: 7e391b23c132f35a8cd2ba3a6de7a0f9b4939827d9fafd8207d8b3c94a8cd68c
font_01_sfnt_off00011221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11221 10644 bytes
SHA-256: fcd6f06590db640a92b5610a0b577263510632bda39cb1be70880b0ac507db53
font_02_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1