Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b94ed86a3ac0f4…

MALICIOUS

PDF

75.8 KB Created: 2021-07-29 22:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b7c88265be1794bca0b619bd8aabb19 SHA-1: 77e82d99b18f6d1bd5a6ed35f032f93af91d5064 SHA-256: 30b94ed86a3ac0f4c9e8ca9c1e32bc9a9680a967cb4f0893023f6fcec7cbecc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm or distribution point for malicious content. The presence of these links indicates an attempt to manipulate search engine results or lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d52523d83---sidoximuxas.pdf
    • http://dermalab.pl/userfiles/file/xakiserunokow.pdf
    • http://tcurryproperties.com/konadnew/userfiles/file/wewarowedipoxamulefino.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/0f7266c23fdc791792e759e6b84f8d11/vorulidegesev.pdf
    • http://vladjurnalist.ru/archive/file/50163603420.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/584fbc3a373f218b00dd1ee854e75bfb/nipuvuminafetaguguvakemis.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087aa6175a93---kagam.pdf
    • http://mwflower.com/upimagesfile///90705040600.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/acecbd66baa5fe95ea1d9a1e8ab56ecb/nisokoreni.pdf
    • http://co-wemart.com/careeruserfiles/file/vowelufadasopa.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f693ec7c4---nudikujekowelep.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfddc93c24---lewarezofefekanubaj.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2da985e4e---69969126515.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/soboxodabijuziwixes.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4d56842d---95191103362.pdf
    • http://predit.ru/admin/ckfinder/userfiles/files/27956953721.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa19d8e964---3140202928.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3dc026e8e---zerezezoboj.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98a3e32ad---2362854751.pdf
    • https://temahr.hr/files/37571080827.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160accf38ad2a3---95131051879.pdf
    • http://hyosangjo.com/userfiles/file/20210704040954.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e0a6330af---mosateninepebizatud.pdf
    • https://bak.vn/upload/files/23380389458.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+restring+echo+weed+eater+srm+225
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39b.bin
e96753f3e995e65f4b0f8ec2145aadbdbb7351694aaf7c0d62c8b8fabc6b4c54
pdf-font-stream PDF embedded font (sfnt) at offset 0xC39B 11100 bytes
font_01_sfnt_off0000dd3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3D 16792 bytes
font_02_sfnt_off0000f54f.bin
027e058a0b5bc7cb399d63d074b1785608da98fcfa2c3c0bdf550fe2ef89ec9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 16700 bytes