Malicious PDF — malware analysis report

Static analysis result for SHA-256 e248c25d289b4121…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 16:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80bcd4309fc0bda82680a69da0194f63 SHA-1: 316292e071ff06c6fc95ea175ab9e3642991a2d3 SHA-256: e248c25d289b412194015365ff3573b35af26707886f6553ca8f51e98c01dc14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage vulnerable infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d5411efcd958bcc225c34094b94fa92c/39541021873.pdf In PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/lepamiwezoxo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8c4a795a---95736419362.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/mixalewo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6d59f70b8369b3a77b32fc2045bae613/74286491470.pdfIn PDF document text
    • http://climtech.com/files/files/suvudarimoxup.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/51316605472.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/vagof.pdfIn PDF document text
    • http://gibisch.com/files/files/wemiwex.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/80334141898.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5e23b721bb5b0133a7ab4093e65ac360/lisaxafokawuxeku.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/vasese.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ba74b30c---83381809201.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/pijoma.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/93922136942.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/84839123193.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff54369c96---84033009241.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a005c9ab---fivetimufifaru.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/pinojavogele.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/tuwixuwodufumuxur.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0945cab6b4---37643207350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+latvian+gambit+lives+pdfPDF 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 18544 bytes
SHA-256: 2318a45439e22530ce785a649fdaf147c980858df8197c058163f39f2601688c
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 10896 bytes
SHA-256: e2b5553319f4d1d8b1ad7c7ab6523a2b04e6371aebc3bfbbe935202bd8c4bf1d
font_02_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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