Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a083edd6988b50…

MALICIOUS

PDF

89.8 KB Created: 2021-09-02 23:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a0315279bcc36a61e0da60742da2943 SHA-1: bdf6a13ee8bdc88b217ce3c800a99b9ef6e2cd7d SHA-256: c3a083edd6988b5058cc8a0e86664d9df8235362587a401537231ccb13c19b9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://mai-colle.jp/userfiles/file/gaxivesomoxetoketufuwiz.pdf In PDF document text
    • http://dralituncer.net/userfiles/file/kurewijinopu.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/jowaj.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/3952b5b4e8df3c89fb8196cbb0fda0bb/dodapudaxutorazez.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/20598486991.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/totv39qnsm4kivmfgefqhf5bu3/52298302234.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8b6b93e5---46697623625.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c322bbac9---digavelesadi.pdfIn PDF document text
    • http://soles2walk.cz/data/file/batelapimadogudakomadoma.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/xivipunemamaxitik.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b457f3ae42b---58050979063.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/41597533388.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9794daf0d---9123058837.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/17053454650.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/45587555370.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6np87jgmrapj41uvgdi36kqrp4/36347024008.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/jvkcegd7k7hpn21g1lp2rm7k3v/16767599196.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1f55a00632a43185dee5025fb9500505/57822009910.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/21197337252.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/zomijegupuguzigajeloginu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/togekegodumo.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/162362260705.pdfIn PDF document text
    • http://rentaruedas.com/files/others/91184056652.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/58c265e0763c49ce30801f436c234c27/41407444333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=soredemo+sekai+wa+utsukushii+manga+espa%C3%B1ol+pdfPDF 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 22772 bytes
SHA-256: 39f5588da1da9a561f324d6e30da3be14e9ccfa5f1adb3b350cf720c879cecad
font_01_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 11504 bytes
SHA-256: 6ada168eb51912cc7219dc3a1dda435d4094d67feeab1f3106365cf05d59c4d6
font_02_sfnt_off00013ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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