Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1beda7978f04f6…

MALICIOUS

PDF

86.5 KB Created: 2021-07-26 02:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12717486a04d49a41a92172597bc6640 SHA-1: c5cf58f97bf3bf35c6304597394a1723686c010f SHA-256: 1d1beda7978f04f65b1ede8587b68e1b120165fd81546af780b48474318ca3b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDF files hosted on compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploiting vulnerabilities through linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://red-adlay.com/upload/files/95617156918.pdf In PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff0221298c---rituxiziniwowovemexajure.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/xisugosas.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607951321bc7a---jipomawukijexixuxomunu.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/46037866789.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/d979bfa3740ee9f2aee208cb8c06dd81/45698719723.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/78674546677.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/toselewozipuwulovanebowub.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978793a4935---31704096315.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdac844d17---vivax.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd6c152ebb---63853319862.pdfIn PDF document text
    • http://carszana.com/image/upload/File/63976732333.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/8473065676.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b867309375---lozerap.pdfIn PDF document text
    • http://ibb-online.ru/f/file/49813073450.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/tigafexaburalupifijulaxir.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210608_132520.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1622656612lotovufumezinezizovaza.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/89dfc3b9f32a980055e9ee3ef3cc3827/jiloramen.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/2p83h69q83v15u9edn9oclr370/8867562532.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/mavirorajuda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=primary+colors+of+light+worksheet+for+kindergartenPDF 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_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 16600 bytes
SHA-256: dad93d7442092f3a9beff54d9dbd9052de70fcfb5e797269c36d04335903d6f7
font_01_sfnt_off000118b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 11216 bytes
SHA-256: ebd81a622168dac1bbce86c54c514c06ee910272bbe1d14f7a769cbcc5497a2a

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