Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74b5e40bb72762f…

MALICIOUS

PDF

73.6 KB Created: 2021-06-18 09:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a658ba635187444c31f05b6d8b610a70 SHA-1: d3cb85dc0ce8b6fb6e34774fc8d470fb427bbbe8 SHA-256: d74b5e40bb72762fce267995eb34d3b83260332b2d87d8446a19dc4f1dd035b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised and disposable hosting sites, disguised as a download for AdoptOpenJDK JRE. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phishing content. The embedded URLs and the nature of the link farm suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://klcmekatronik.com/ckfinder/userfiles/files/liratawobifupexibosuf.pdf
    • https://norservis.com/files/files/duxitawatimoniragiduki.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f9caf4ac---62600942007.pdf
    • https://istanbulbalbir.com/upload/ckfinder/files/65316895711.pdf
    • https://mimpi1pusat.com/contents//files/22529215027.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abc6894570---zixakidodipidulixe.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d79d73d6ec---77642629299.pdf
    • http://www.knickmeier.net/images/pageimg/file/venurujejovuvel.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeoq11ksnpvogtjg5r7qns0pl1/wevimejid.pdf
    • https://festival.bg/fckeditorfiles/file/fezupegudor.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d453b1a6e8---dimepivam.pdf
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/h1eujmeooq4vvveeca66p8jcve/29784741979.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f817b292---jimebakamepizupose.pdf
    • https://ekransamara.ru/files/58922637051.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/n2n2t5ep3kc0l2unvc38061tvg/37846163259.pdf
    • https://airbays.com/userfiles/file/mewagoxepirivebutoduxo.pdf
    • http://ccsl.asia/files/laluw.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e6fee766f57a2901f4645e7b6718fda6/65914717142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=adoptopenjdk+jre+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e56e.bin
724ae3787930b939a40bdf496ccd318a110b2e4073213a9d1422a9151603468e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56E 4996 bytes
font_01_sfnt_off0000f690.bin
66678b3488313983daa4ff7bdcd06eeeed81f58cd5b5ff14ec92d0f015d448f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 11124 bytes

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