Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bc38d05e381964…

MALICIOUS

PDF

131.7 KB Created: 2021-07-24 05:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30dffda08db74ae1f8d0fb6cfb8b9e28 SHA-1: 1a25b3c97565150a06a415dd9fcbf2f7dfc65259 SHA-256: d9bc38d05e3819644e24b339d1941482c733da31c0879c023fd55141213335de
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d2738bc0458---9206610534.pdf In PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/boguxiwaliwivaroxitus.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/10003199728.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdde69c3769---93073174013.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ei8i3o5pm43q1jdtvt2nd3kak2/56826782171.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6e10dcea406dd5f47b85788ab30c0b3a/39871866624.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/1passp3lh92ijkjmocunckr81t/vabetezepot.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/47250619269.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/39122394893.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/mugikifizobarivotepet.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rb5t8f9jpt17hleemvvnkaqm7k/20195304407.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/74618565069.pdfIn PDF document text
    • https://amblamy.ee/upload/file/42419272181.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tozedoxanumamodibifoleda.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/paxatuwiwujupavos.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/losegewutavepezatele.pdfIn PDF document text
    • http://alconburyreunion.com/clients/36523/File/83558727041.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608066d7792dc---75791762896.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21967b4b59---vizoguwe.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4bmne0eau2i2h2o14p6eaegika/mowojadom.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/40996392715.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/87581391493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=makkar+ielts+general+writing+task+2+pdf+2021PDF 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_off00019ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ED3 17712 bytes
SHA-256: b023108becc4cb81eb530bb47cefd9ee0a399d92063778c7e130a3afa3c7dc32
font_01_sfnt_off0001cd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E527 11020 bytes
SHA-256: 20f2f79e4a4bc18e3108c47a204b32c375727667790719a867d10245e75afc1b

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