Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a331b8f2c46e6bd…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 21:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f87f85685fabee15397c4c6892b8c7d SHA-1: 39830219de649d8ca13df1af702d34f637614b89 SHA-256: 8a331b8f2c46e6bdabb46bc802656c114a2f8d4459054eda1b284cd9576c3398
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit vulnerabilities or perform malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/ziwirurakulusunigamupova.pdf In PDF document text
    • http://svsteinfurth.de/radsportfiles/file/87294879576.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/zanewirusidekixikes.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a789471d0973fede4343505d501f807f/55259113728.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/698642328.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/dadomepetutisowogasikoral.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/pokikakufozadebenizuponez.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109171209162925.pdfIn PDF document text
    • http://rld-carbon.ru/file/71406835414.pdfIn PDF document text
    • https://everestart.com/images/stories/file/fesejilizojo.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/31218386873.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tkv845fte0k5rhi0sdnuub5scc/rediburekitujufogef.pdfIn PDF document text
    • http://lovesenergy.com/file/92613877319.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a65aaaad3---67482021216.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/34919509476.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/4900904689.pdfIn PDF document text
    • https://nileagriculturalindustries.com/file/nemawotarojabufuj.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/78271196464.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/39174856372.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/nerekubeno.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/levibaxekalijeriposod.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/tatimigiwazemugodipuzek.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132cc08ea33c---51900977175.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/89960444708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=que+es+iu+del+sistema+androidPDF 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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 18816 bytes
SHA-256: 34120636c0c1ea3a0f56eddccb93340421a096a6618f584d8388908b83a28e6b
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10568 bytes
SHA-256: 8087b6a00897dc86c4496ca07a2892b8603f69573f2ca0357a8ec8a4a3b7c98f
font_02_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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