Malicious PDF — malware analysis report

Static analysis result for SHA-256 5864a518af9bccef…

MALICIOUS

PDF

84.6 KB Created: 2021-06-29 19:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b906997d391b58a264327f7dfb6d0ea SHA-1: e80996aed3401fe9c8306596cd08ca1f7817a1e6 SHA-256: 5864a518af9bccef5c72509fd5f3f3bbd0155661f583e45c54662e08fde221dc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URLs, many pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=the+beast+and+the+antichrist PDF link annotation
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089334c77c1d---78667076224.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/digusimiperofininirelam.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841338db8a4---33087268768.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a786d67842---lurafiwanumiroxujodiged.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/48326592574.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/20fb015d4597578cfb152a1532ea27be/24155092213.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c612f50bf7c---kopapumewazeze.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4brcjpt16meuvlj0i54ielnee6/7080438305.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9sg9oi7b0jl400vt8cfi7a7q6d/wakimarapodesemajevazerel.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/8375896761.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/98115662492.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b076ffae13b---21134152977.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1ec2050e65565b3f2572bb3eac0e0f95/25007916892.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/jejademimolubosibudetusis.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///zugozodizajujud.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/fipepapujojepagoxokab.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/55314249242.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f13b216cf9---40064623515.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/20a1a24a0022d92f0035da8acf932f02/28198471635.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a62b151d4a28ae2d92a7551c4513b415/wajodabaro.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cafff261b5---lofulutezelena.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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 16988 bytes
SHA-256: 28178acf6a0980764d9783614b6c785a794c3eea02f8f21819f2e15a5db5e17c
font_01_sfnt_off000115bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 10404 bytes
SHA-256: 61c4722ef3e412c87c36b88285a961b26fa83fd65a99227e666eea0015e1b3d7
font_02_sfnt_off00012d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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