Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f338437e3d73d3e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-10 15:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b0caa05ddc34188c007eddcc6b3abcb SHA-1: 032b207167f767f8bb84aa9510b718e67d58e1c0 SHA-256: 3f338437e3d73d3e0f4eabf7776d77a44737b1e87febf933941e0b84ea34419b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://brakos.it/file/peritatekikuvexefuxisogib.pdf In PDF document text
    • https://perkunasstudio.com/uploads/files/202109061412163618.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/pegabufewumekibolabo.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/nabusuxu.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/40b10e85da1cfd90c5e2f81c6e9b6cef/zelegujimukepapeminexu.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/12045897457.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/milovilo.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/25624100337.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/nilotedadij.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8379ee458---46399231339.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/13936464708.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/14945078938.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/tomujilowowasejilotiz.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/48653694487.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/23362986789.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/58042865622.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/96175160961.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/vabawugejiwifev.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rks1jqbrfn6qtrnhkarl6k25aj/xejubominugepunoliluvama.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6cf28e0a041f68d326f06b59c9d70018/1921698723.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/87598822040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=watch+dragon+ball+z+kissanimePDF 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_off0000b8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E3 18000 bytes
SHA-256: 262b96cd8fcf6f4ce3aa0b95b93269e4e5e4cfd14920ab99098eb3631add7faf
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 11104 bytes
SHA-256: 4502f100015425ba6b0b7f7ecd98d3ff2c22a24593f9d55133729bc9648fe3f5