Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a18a9f7a40f3ca6…

MALICIOUS

PDF

94.6 KB Created: 2021-06-30 19:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd22a0eea8acfe15609036d29d148ff9 SHA-1: 9de87c0509372eb3fa983d467cdf84f38a8d3655 SHA-256: 9a18a9f7a40f3ca677d4e58fdb229b23ce510d9bf2356485322fb1eb96a815b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc0ef2319---27486548395.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/51916929732.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6np827sluecvusr522esd8p0bs/bodusog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8cfa51f969438765f28da80b5bb018f7/65012420299.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d376de94e---31727717109.pdfIn PDF document text
    • https://stopserv.ru/files/file/26617531693.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/2d979cd6b24be1feb14ac175f26d9a13/kobusupofibol.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a055c07b583---tepejememoxokozalo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c85da864495---69247106751.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160767d008ea64---17273768022.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/25993951894.pdfIn PDF document text
    • http://www.asslar.de/downloads/47696416878.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/iot1f7dq47qrit5c6c0l4bqaeb/makeragumaxoriwebad.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/xesofiwipegovowovof.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/tumavaka.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f952930026---59061837892.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9ac58520---81084353308.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B1FCC1E83A1.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/13106765440.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/cec412c61d4007a5928aa68de16bb022/73158774581.pdfIn PDF document text
    • https://aspirans.com/files/file/bobijukameboniwalodelolo.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/49901104255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+first+move+to+make+in+chessPDF 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_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F7 10764 bytes
SHA-256: bcebe61e376a493da70139d187fc9fa485209262195c0f8a382b714cdb0b6510
font_02_sfnt_off00013da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA0 18696 bytes
SHA-256: 6aee5a8ea51e70cf6ebd696a61a1ccb088a4e8f0658791dd82ced5b339b8f686

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