Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39e6beb416f2221…

MALICIOUS

PDF

59.4 KB Created: 2021-06-23 12:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ab55ad56d2dd085a878b6f11cdda02b4 SHA-1: 49f99412bf917e2e62a3009fb8a6b417df66ef2b SHA-256: c39e6beb416f22217fbab3082f3b13ff3aac030598c2fd3cd088ec21908dee60
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The document body, though heavily obfuscated, contains keywords related to a Stihl manual, suggesting a lure for SEO poisoning or phishing. The ML classifier strongly indicated maliciousness, and the presence of multiple external links supports a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://twr1115.net/files/fckeditor/file/josidobamivol.pdf In PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/df125a19f60f7bda5bf635099d98c81e/zomofituwo.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jnkgifdprftv3m9fe1ha0ame2t/61211559153.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/6016499622.pdfIn PDF document text
    • https://famecosmica.it/file/93402061019.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bfr79o0m93fu5pt9tvoghi0911/52659588915.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce5be9c60---98084470774.pdfIn PDF document text
    • https://memoservicesrl.it/file/44583725544.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8beed98b8f---joserifonedif.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b195dbb03cb---19990970679.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/31771916274.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/5144543457.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/j8nllnpf7tangbe08fiq09s1od/govavor.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd0c7f762---jinuwavijupori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=stihl+fs40c+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC4 5356 bytes
SHA-256: a18e76d2e79760932b1f6d88b6621a7d4c6af119e15641eb1bb40af92a6d04dc
font_01_sfnt_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 10252 bytes
SHA-256: 8351c728b01b121a1aa7c2fd150081ba2d35d70efeb72e0edb4b9e8f89e5ac87

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