Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ddb7aae50c8a1be…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 19:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d736bcb8df365dabc3c5d828aa0b45e8 SHA-1: affc7d1dede067cefdfb17939928274761234927 SHA-256: 0ddb7aae50c8a1be05e127df63a84dd008da65327cbece2199d620e6ca04f654
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic firings confirm the presence of external URIs and a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=dj+cross+pro+download PDF link annotation
    • http://xn--aknmedcal-wpbe.com/uploads/file/55602700420.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6a4606954e9e25600a310dca3a1a4c2e/73540881373.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/66014050138.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/48230768555.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/zebunuzapiwabaso.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/89875522241.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/raruv.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/lepebuzagunabefukuwokopid.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/jekagev.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/9172272334.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/nanekaxenidi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/lorigasuzop.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/94063586242.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/16514359835.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130187db5d0f---ruginez.pdfIn PDF document text
    • https://wineart.online/userfiles/file/21986058755.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8qj24dp62q6omj85gasjtngh4n/betibokutuvepof.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/rategeretebubopug.pdfIn PDF document text
    • http://kechengchem.com/upload/files/28929118181.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb1860f6c---35146759078.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/bawajixikudukefoka.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-15/20210915151409892775.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/mebodepejogajinirolevid.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/92957197470.pdfIn PDF document text
    • 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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 10404 bytes
SHA-256: 834f776f4597732fde75b36698b25892f462c7d313206340b0f72cb006aa1a70
font_02_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 17500 bytes
SHA-256: 59e65dd557e976416af87db0f4ee4006ba246ccbe2f75cb05192e0b152fb2b26