Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3209c8fcb25e2f4…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 18:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8d43a652143382b74f3efc1d1f6950a SHA-1: 5375b7d6ca719b6cd070968e396a925fdc2aa5f6 SHA-256: e3209c8fcb25e2f4cff51b6a3491f3ba60bf6666eabfa5cd4df14e512e13a309
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malware or phish users. The presence of embedded JavaScript, though not fully analyzed here, further supports the execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bearings.vn/images/ckeditor/files/sofade.pdf In PDF document text
    • http://goldmustang.com/files/files/sitegojopuxetugi.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/26208991266.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/69248080343.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/foxaz.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109030736033899.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/nugedirujebug.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/44075975257.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7b9bc813f82223ca57b93c1fbfb946c6/63633250941.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/belenexobowamex.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d0e89fu6i3arq5ub9sl5h6gr0o/lujetikufebaxarapuzo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348762a7622---23833410014.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/16368778619.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/zanixamilevun.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/61280433530.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e5a3879f919e95934efed26534910e1e/7334523975.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109100558458390.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/senigitixokid.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/lemilavatiduluro.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/gadudizazefufalegi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe922b74c---14696384130.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/76496885159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=faltu+full+movie+watch+online+123moviesPDF 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_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 16472 bytes
SHA-256: d0ffcd6bc621521b129bb7e0c031993d5250752b114c09dc6865398fa6448b76
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 11072 bytes
SHA-256: 322a158ba57f617e8e281acfc180c41df00e2a98982365140764739971ba4e19