Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b456c393ca82b6…

MALICIOUS

PDF

62.3 KB Created: 2021-06-01 06:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d60e310267237c9e7c759cc99de9c8c7 SHA-1: 515a0a643ed812ec69ee37da1c6d29abfbb2bf89 SHA-256: 31b456c393ca82b6162db5926e6f7ffba185bcb134c7ddc016822c2605226fce
94 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting it's used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a technique to distribute malicious links or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9420

Heuristics 4

  • 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
  • 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://wastran.ru/uplcv?utm_term=oxford+phonics+world+3+phonics+cards+pdf PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efdcea7cb4---mudesiworewojuxavaba.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ee496e985084941814b6df056d81eb70/77256372826.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d033bf52---44522093689.pdfIn PDF document text
    • http://furniture83.com/upload/files/93950479739.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/55973831801.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607375ed90b09---xaxiguwusiluvenapibitigu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb092574f---lixudolen.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4ceebb47b56933858137cf74b94d5959/50640293785.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/49sfiagv2pmsepb8mj61qvfnp2/43569968630.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db4394900---tozedefi.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a9a2b179---modogipusolidulivalimax.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ba5207d207cfe5550cf65fc7fe66aace/gulatisevaruwulabodero.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ec74b4c9ccdbac271de089476a81c797/pazudifelinififoxibubi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9eb1162c6---sewawiwe.pdfIn PDF document text
    • https://abeess.com/userfiles/file/87787487155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E0 2980 bytes
SHA-256: d9c005c9c53af89abef45fefc5521339f39650ffb63034179f71376b763eca02
font_01_sfnt_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 5596 bytes
SHA-256: 5c8a894b20e59e491dd472e6a4e59eebe74cac6e9212a1ab526cf00ce3f74bef

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